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Splash & Skimmer

Floats & Fun · Best Foam Float

The best foam pool floats, ranked by a number you can actually check

Buy the 2.5 in Ultra Sunsation if you want the most foam and the best value per pound of it. The reason this page can say that, and a page about inflatable floats cannot, is that foam makers publish thickness and inflatable makers publish nothing.

By Sawyer V., enthusiastLast updated
TRC Recreation Ultra Sunsation Pool Float, 2.5 in

Heads up: we earn a commission if you buy through the links on this page, at no extra cost to you. It never decides the ranking — here is how we pick and here is the full disclosure. Prices are checked automatically; last verified October 17, 2026.

Quick picks

Segmented before it is ranked — the right answer depends on which of these you actually are. Tap any row for the full write-up.

Best overall, and best value per pound of foam

The thickest mat here at a published 2.5 in and 14 lb, and the cheapest foam per pound once you divide. The top of the range being the value pick is unusual and it is what the published figures say.

#ProductBest forScorePrice
1
TRC Recreation Ultra Sunsation Pool Float, 2.5 in
TRC Recreation Ultra Sunsation Pool Float, 2.5 in

Published at 2.5 in thick and 14 lb, which is nearly twice the material of the 1.25 in Splash at the same 70 in length. Divide price by published weight and it is also the cheapest foam per pound here — the top of the range is the value pick, which is not how this usually goes.

The most foam, and the best value per pound of itSeveral seasons8.1out of 10

The benchmark the category is priced around

A published 1.75 in and 9 lb on the same 70 x 26 in footprint. If you have seen one foam float at a pool store, it was this one or its twin.

#ProductBest forScorePrice
1
TRC Recreation Sunsation Pool Float, 1.75 in
TRC Recreation Sunsation Pool Float, 1.75 in

The float the foam category is priced around: 1.75 in of vinyl-coated closed-cell foam on the same 70 x 26 in footprint as the cheaper Splash, with a published 9 lb item weight against the Splash's 7.3 lb. The thickness ladder here is real and it is published.

The category benchmark, and the middle of a published thickness ladderSeveral seasons7.5out of 10

The cheapest way into foam, if you want a mat

Same footprint, a published 1.25 in and 7.3 lb. It is a third less foam than the Sunsation and it is the worst value per pound here - but it is still foam, which means no valve and no seams.

#ProductBest forScorePrice
1
TRC Recreation Splash Pool Float, 1.25 in
TRC Recreation Splash Pool Float, 1.25 in

The entry point to vinyl-coated foam, published at 1.25 in thick on a 70 x 26 in mat. It is the same footprint as the dearer Sunsations and a third less foam — which the published 7.3 lb item weight confirms rather than implies.

The cheapest way into foam, and the thinnestSeveral seasons6.6out of 10

Under forty dollars, and the only published warranty term

A saddle rather than a mat: you sit in it with your legs in the water. The only float on this page publishing both a warranty term and a country of manufacture.

#ProductBest forScorePrice
1
TRC Recreation Super Soft Foam Water Saddle
TRC Recreation Super Soft Foam Water Saddle

Not a mat but a saddle you sit on, at 36 x 18 in and 1.45 lb. It is the cheapest honest way into closed-cell foam, and it is the only float on this page publishing both a warranty term and a country of manufacture.

Foam for under forty dollars, and the only one here with a warranty termSeveral seasons7.4out of 10

If you want the chlorine claim in writing

Vinyl-dipped rather than coated, and the only pick here stating UV and chlorine resistance outright. Read its warranty field before you pay a Sunsation price for 1.25 in of foam.

#ProductBest forScorePrice
1
California Sun Luxury Vinyl-Dipped Pool Float
California Sun Luxury Vinyl-Dipped Pool Float

Vinyl-dipped closed-cell foam at a published 70 x 25 x 1.25 in, and the only float here that states resistance to UV and chlorine outright. It is also the only one whose listing publishes its warranty as "No Warranty", which is worth knowing before you pay a Sunsation price for it.

The foam float that publishes a chlorine claim and no warrantySeveral seasons6.3out of 10

The short version

  • Foam publishes thickness. Vinyl publishes nothing. 1.25 in, 1.75 in and 2.5 in are printed on the listings. No inflatable float at any price publishes a gauge.
  • The thickest mat is the best value per pound of foam. About $13.20 per published pound against about $14.80 for the thinnest, at the live prices on this page.
  • No foam float publishes a weight capacity. The budget inflatables do. Each material class withholds exactly the spec the other one gives you.
  • Storage is the real cost. Seventy inches of rigid board that cannot be deflated, and the makers’ own instruction is to keep it flat and dry.

Buy the 2.5 in Ultra Sunsation. It is the thickest float here, it is the cheapest of the three mats per pound of published foam, and thickness is the only thing that separates floats in this class. If that is more money than the job is worth, the 1.75 in Sunsation is the category benchmark and the 1.25 in Splash is the cheapest honest way to own foam. Skip the mats entirely if you have nowhere flat to store 70 inches of board, and buy the water saddle instead.

That recommendation is unusually confident for a float page, and the reason is not that we have floated on these. It is that this is the only corner of the float category where the decisive specification is published as a number.

Why this page can rank floats and our inflatable pages cannot

When we compared cheap floats against premium brands, the finding was that the spec which would settle the argument - vinyl gauge - is published by nobody. Not Intex, not Bestway, not FUNBOY, not SUNNYLiFE. The premium language was adjectival: thick, puncture-resistant, durable. The only quantitative hint available was product weight.

Foam is different, and it is different in the one way that matters. Thickness is in the product title:

Published thickness, dimensions and item weight for vinyl-coated foam mats at the same footprint.
FloatPublished thicknessFootprintPublished item weight
TRC Splash1.25 in70 x 26 in7.3 lb
TRC Sunsation1.75 in70 x 26 in9 lb
TRC Ultra Sunsation2.5 in70 x 26 in14 lb
California Sun vinyl-dipped1.25 in70 x 25 in7 lb
Published thickness, dimensions and item weight for vinyl-coated foam mats at the same footprint.

Three mats, one footprint, three thicknesses, three weights - and the weights climb with the thickness, which is what you would expect if the figures are real. That internal consistency is itself evidence. A category inventing numbers does not usually bother to make them add up.

The value test the category permits

Because both thickness and weight are published, foam allows a comparison no other float category does: price per pound of material. The mats are the same length and width, so the only variable is how much foam is in them.

Cost per pound of published foam

TRC Splash, 1.25 in
$107.99 / 7.3 lb published
TRC Sunsation, 1.75 in
$134.99 / 9 lb published
TRC Ultra Sunsation, 2.5 in
$184.99 / 14 lb published

sticker price / published item weight = $ per pound of float

About $14.80, $15.00 and $13.20 per pound

Prices are the live figures shown in the buy buttons on this page and move with Amazon; the weights are published and do not. The ordering is the point rather than the exact cents: the thickest mat is the cheapest per pound of foam and the thinnest is the dearest. Item weight includes the vinyl coating as well as the foam, so treat it as material content rather than foam content.

This inverts the usual shape of a roundup, where the budget pick wins on value and the premium one wins on everything else. Here the premium pick wins on value too, and the only reason to buy down the range is the amount of money you want to spend in one go.

What foam does not tell you

Every float category withholds something, and in foam it is the capacity. Not one product on this page publishes a maximum user weight. The California Sun listing gets closest with “supporting most users”, which is a sentence rather than a number.

Set that against the inflatables. Intex publishes a 220 lb limit on the King Kool and two air chambers; Bestway publishes a capacity on its Kool Lounge. So the position is exactly symmetrical:

What each float material class publishes, and what it withholds.
Material thicknessWeight capacityChamber count
Vinyl inflatablesNever publishedUsually publishedUsually published
Vinyl-coated foamPublished in inchesNever publishedNot applicable
What each float material class publishes, and what it withholds.

If you need a stated weight limit - because the float is for a heavier adult, or because you want something to point at - foam cannot give you one and a budget inflatable can. That is a real reason to buy an inflatable float instead, and it is the only one on this page we would defend.

Mat or saddle

The 70 in mats and the 36 x 18 in water saddle are not competing products. A mat is for lying flat on the surface; a saddle is for sitting upright with your legs in the water, which is what people actually want in a pool small enough that lying down means touching both walls.

For a 10 ft or 12 ft above-ground pool, the saddle is the better buy and it is a quarter of the price. Our small-pool float page makes the general version of this argument: in a small pool, draft and footprint beat surface area every time.

The saddle also carries the only two published claims on this page that have nothing to do with foam: a “Limited 1 Year Warranty Against Manufacturer Defects” and “Made in the USA”. The Ultra Sunsation listing names a “Manufacturer Warranty” with no term attached, and the California Sun listing publishes its warranty field as “No Warranty” - at a price within a few dollars of the 1.75 in Sunsation. That is worth a second look before buying on styling.

The storage problem, stated plainly

A foam mat is a rigid board. It does not deflate, it does not fold and it does not roll. Seventy inches of it has to live somewhere between swims, and the makers’ own guidance is to “store flat and dry, away from extreme temperatures”.

In practice that means a garage wall, a shed, or hooks under a deck. It does not mean a poolside storage bin, which is sized for deflated vinyl and noodles. If the honest answer is that it will live leaning against the fence in full sun, buy a cheap inflatable instead and accept replacing it - that is the same conclusion our float lifespan guide reaches for every float material: what kills them is the twenty-three hours a day they are not in the water.

Who should skip foam entirely

  1. Anyone with nowhere flat and shaded to keep a 70 in board

    This is the single most common reason a foam float is the wrong purchase. The mat outlasts vinyl only if it is stored the way the maker says.
  2. Anyone who needs a published weight limit

    No foam float publishes one. A budget Intex or Bestway lounge does, and that is a legitimate reason to choose vinyl.
  3. Anyone buying for a pool under 12 ft

    A 70 in mat is most of the water. Buy the saddle, or a noodle, and keep the pool usable.
  4. Anyone who wants to take a float on a trip

    Foam does not pack. An inflatable lounge and a pump are the right answer for a car or a suitcase.

What we are not claiming

That foam lasts longer than vinyl. We have not run these for three summers, nobody publishes a service life, and any page that ranks floats on durability is ranking them on anecdote. The structural argument - no valve to leak, no seam to split, no air chamber to lose - is a statement about failure modes, not a measured lifespan.

What is defensible is everything above: that thickness and weight are published here and nowhere else in the float category, that the weights are consistent with the thicknesses, that the thickest mat is the cheapest per pound, that no foam float publishes a capacity, and that one of these products publishes its warranty as “No Warranty”. All of that is checkable in a minute, which is more than this category usually allows.

The picks, in full

Scores are our own reading of published specifications. They are not test results — we have not tested these products and we do not claim to.

TRC Recreation Ultra Sunsation Pool Float, 2.5 in

Pick #1 · The most foam, and the best value per pound of it

TRC Recreation Ultra Sunsation Pool Float, 2.5 in

Texas Recreation

Published at 2.5 in thick and 14 lb, which is nearly twice the material of the 1.25 in Splash at the same 70 in length. Divide price by published weight and it is also the cheapest foam per pound here — the top of the range is the value pick, which is not how this usually goes.

$184.99 · View on Amazon

#ad how this is funded · price as of October 17, 2026

Key specs

Foam thickness
2.5 in, published in the title and stated again in the features as "2.5-inch-thick buoyant foam"
Size
70 in long x 26 in wide x 2.5 in thick, published in the features
Item weight
14 lb, published
Material
Foam with waterproof vinyl coating, published
Headrest
Built-in pillow, published as adding extra buoyancy
Warranty
Listed only as "Manufacturer Warranty" with no term stated
Weight capacity
Not published

How it scoresour reading of published specs, not a test result

Thickness
9.5
Build
8.5
Storage
4.0
Comfort
9.0
Value
8.0

Overall 8.1 / 10

What works

  • Twice the published foam of the entry model, which is the one thing that separates floats in this class
  • Cheapest of the three per pound of published material, by the arithmetic on this page
  • Rides higher out of the water, which is the practical consequence of thickness
  • No valve, no seams, no inflation — the same structural argument as the rest of the range, with more of it

What doesn't

  • 14 lb is heavy to carry wet, and heavy to hang up
  • The dearest float on this page by sticker price
  • The listing's structured dimension fields are plainly wrong (height 26 in, width 2.5 in) — the real figures are in the title and features
  • Warranty is named without a term, so there is nothing to hold it to

Skip it if: Small pools. Seventy inches of rigid foam in a 10 ft pool is most of the pool, and unlike an inflatable you cannot fold it out of the way.

What it costs to run: Price per pound of published foam is the only value test the category permits: about $13.20 per pound here against about $14.80 for the 1.25 in Splash and about $15.00 for the 1.75 in Sunsation, at the live prices shown on this page.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: TRC Recreation Ultra Sunsation 2.5 in — current Amazon listing, published thickness, dimensions and item weight

TRC Recreation Sunsation Pool Float, 1.75 in

Pick #2 · The category benchmark, and the middle of a published thickness ladder

TRC Recreation Sunsation Pool Float, 1.75 in

Texas Recreation

The float the foam category is priced around: 1.75 in of vinyl-coated closed-cell foam on the same 70 x 26 in footprint as the cheaper Splash, with a published 9 lb item weight against the Splash's 7.3 lb. The thickness ladder here is real and it is published.

$134.99 · View on Amazon

#ad how this is funded · price as of October 17, 2026

Key specs

Foam thickness
1.75 in, published in the listing title and features
Size
70 in x 26 in, published
Item weight
9 lb, published
Material
Vinyl-coated closed-cell foam, published
Headrest
Built-in roll pillow, published as adding buoyancy as well as support
Model
8020026, published
Weight capacity
Not published

How it scoresour reading of published specs, not a test result

Thickness
7.0
Build
8.0
Storage
5.0
Comfort
8.0
Value
7.5

Overall 7.5 / 10

What works

  • The middle rung of the only published thickness ladder in the float category
  • 9 lb of published material against 7.3 lb at the same length, so the extra half-inch is accounted for
  • Closed-cell foam has no air chamber, so there is nothing to puncture and nothing to re-inflate
  • Built-in roll pillow is structural rather than an inflatable add-on that can fail separately

What doesn't

  • No weight capacity published, which the budget inflatables do publish
  • Rigid and 70 in long, so storage is a real constraint rather than an afterthought
  • Vinyl coating is the wear surface; once it splits, water gets into the foam
  • Costs several times a vinyl lounger that does the same job for one summer

Skip it if: Traveling. This does not roll, fold or deflate, so a float you want in the trunk is the wrong use for it — a water saddle or an inflatable is.

What it costs to run: The arithmetic that justifies foam is replacement cycles, not comfort. At the live prices on this page it costs roughly four Intex King Kools; our float lifespan guide argues an inflatable is destroyed by storage rather than swimming, and foam removes the two parts that fail — the valve and the seams.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: TRC Recreation Sunsation 1.75 in — current Amazon listing, published thickness, dimensions and item weight

TRC Recreation Splash Pool Float, 1.25 in

Pick #3 · The cheapest way into foam, and the thinnest

TRC Recreation Splash Pool Float, 1.25 in

Texas Recreation

The entry point to vinyl-coated foam, published at 1.25 in thick on a 70 x 26 in mat. It is the same footprint as the dearer Sunsations and a third less foam — which the published 7.3 lb item weight confirms rather than implies.

$107.99 · View on Amazon

#ad how this is funded · price as of October 17, 2026

Key specs

Foam thickness
1.25 in, published in the listing title and features
Size
70 in x 26 in, published
Item weight
7.3 lb, published
Material
Vinyl-coated closed-cell foam, published
Headrest
Built-in roll pillow, published
Weight capacity
Not published — no foam float in this category publishes one
Storage guidance
"Store flat and dry, avoiding extreme temperatures", published

How it scoresour reading of published specs, not a test result

Thickness
5.0
Build
7.5
Storage
5.0
Comfort
6.5
Value
7.0

Overall 6.6 / 10

What works

  • Thickness is published as a number, which is more than any inflatable float in this category offers
  • Nothing to inflate, no valve to leak and no seam to split — the three failure modes of a vinyl lounger
  • Item weight is published too, so foam per square inch can be checked rather than trusted
  • Vinyl coating wipes clean, and the maker states soap and water is the method

What doesn't

  • The thinnest foam here, and thickness is what you are buying
  • Worst value per pound of foam of the three TRC mats once you divide price by published weight
  • No weight capacity published, so there is no stated upper limit for a heavier adult
  • Rigid: it does not fold, so it needs somewhere flat to live out of the sun

Skip it if: Being stored anywhere small. A foam mat is 70 in of rigid board that cannot be deflated, and the maker's own guidance is to keep it flat and dry — which is a shed or a garage wall, not a deck box.

What it costs to run: Priced against its own published weight this is the dearest foam here: $107.99 for 7.3 lb is about $14.80 per pound, against about $13.20 per pound for the 2.5 in Ultra Sunsation. Both prices are the live listing figures shown on this page.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: TRC Recreation Splash 1.25 in — current Amazon listing, published thickness, dimensions and item weight

TRC Recreation Super Soft Foam Water Saddle

Pick #4 · Foam for under forty dollars, and the only one here with a warranty term

TRC Recreation Super Soft Foam Water Saddle

Texas Recreation

Not a mat but a saddle you sit on, at 36 x 18 in and 1.45 lb. It is the cheapest honest way into closed-cell foam, and it is the only float on this page publishing both a warranty term and a country of manufacture.

$37.99 · View on Amazon

#ad how this is funded · price as of October 17, 2026

Key specs

Size
36 in x 18 in, published
Item weight
1.45 lb, published
Material
"High-quality, closed-cell foam" with a vinyl coating, published
Warranty
"Limited 1 Year Warranty Against Manufacturer Defects", published
Made in
"Made in the USA", published in the feature bullets
Vinyl coating purpose
Published as protecting "from damage from the sun, chlorine, or saltwater"
Foam thickness
Not published for this model

How it scoresour reading of published specs, not a test result

Thickness
5.0
Build
8.0
Storage
9.0
Comfort
6.0
Value
9.0

Overall 7.4 / 10

What works

  • The only float on this page with a published warranty term rather than the word "warranty"
  • Publishes Made in the USA, which the rest of the category does not state either way
  • Keeps an adult upright without treading water, which a flat mat cannot do
  • Light enough and small enough to actually store, unlike the 70 in mats

What doesn't

  • Foam thickness is not published for this model, so the spec the rest of the range is sold on is missing here
  • Sitting, not lying — it is not a substitute for a lounger
  • No weight capacity published
  • A handle rather than a tether, so it drifts like everything else

Skip it if: Sunbathing. You sit in this with your legs in the water, which is the opposite of what a foam mat is for. Buy it as the cheap way to own foam, not as a lounger.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: TRC Recreation Super Soft Water Saddle — current Amazon listing, published size, item weight, warranty term and Made in the USA claim

California Sun Luxury Vinyl-Dipped Pool Float

Pick #5 · The foam float that publishes a chlorine claim and no warranty

California Sun Luxury Vinyl-Dipped Pool Float

California Sun

Vinyl-dipped closed-cell foam at a published 70 x 25 x 1.25 in, and the only float here that states resistance to UV and chlorine outright. It is also the only one whose listing publishes its warranty as "No Warranty", which is worth knowing before you pay a Sunsation price for it.

$129.71 · View on Amazon

#ad how this is funded · price as of October 17, 2026

Key specs

Size
70 in x 25 in x 1.25 in, published
Foam thickness
1.25 in, published ("Measures 1.25 inches thick")
Item weight
7 lb, published
Material
"High-grade closed-cell foam that is buoyant and is dipped in vinyl", published
Chemical resistance
Published as "resistant to UV rays and chlorine"
Warranty
"No Warranty", published on the listing
Weight capacity
Not published — the listing says only "supporting most users"

How it scoresour reading of published specs, not a test result

Thickness
5.0
Build
7.0
Storage
5.0
Comfort
7.5
Value
5.5

Overall 6.3 / 10

What works

  • States UV and chlorine resistance explicitly, which the TRC listings do not
  • Publishes thickness, dimensions and item weight, so it can be compared on the same terms as the TRC mats
  • Vinyl-dipped rather than wrapped, which is a stated construction difference rather than an adjective
  • Integrated headrest at a thickness and weight that match the cheapest TRC mat

What doesn't

  • Warranty published as "No Warranty" at a price within a few dollars of the 1.75 in Sunsation
  • Same 1.25 in thickness as the cheapest TRC mat for about twenty dollars more
  • "Supporting most users" is the entire published capacity claim
  • Stock has been thin on this listing, so availability is less dependable than the TRC range

Skip it if: Being the value choice. On published figures it is a 1.25 in float at a 1.75 in price with no warranty — buy it for the vinyl-dip construction and the chlorine claim, not to save money.

Several seasons: Buy-once. Built and warranted to come back out of the box for a few years, if you store it properly.

Specs from: California Sun vinyl-dipped foam float — current Amazon listing, published dimensions, thickness, item weight, chlorine/UV claim and warranty field

Intex King Kool Inflatable Lounge

Pick #6 · The budget benchmark, and the only pick here that publishes a weight limit

Intex King Kool Inflatable Lounge

Intex

The float everything else on this page is priced against. Intex publishes a 220 lb limit, two air chambers and an included repair patch — more hard specification than any premium float in this comparison.

$16.19 · View on Amazon

$18.5012% off

#ad how this is funded · price as of October 17, 2026

Key specs

Maximum weight limit
220 lb, published by Intex
Air chambers
Two, published — a puncture in one does not sink the whole float
Size
Approximate deflated size 63 in x 33.5 in, published
Product weight
3.47 lb, published
Repair patch
Included, published
Age grading
Designed for adults, published
Vinyl gauge
Not published — and no brand in this comparison publishes one

How it scoresour reading of published specs, not a test result

Storage
8.0
Value
9.5

Overall 7.8 / 10

What works

  • Publishes a maximum weight limit, which is the single most useful float spec and the one premium brands omit
  • Two air chambers is real redundancy rather than a marketing line
  • Repair patch in the box, which tells you the maker expects the float to be repairable
  • Cheap enough that a two-season life is an acceptable outcome rather than a disappointment

What doesn't

  • No vinyl gauge published, so thickness cannot be compared against anything
  • 3.47 lb of material for a 63 in float is the lightest construction in this comparison
  • Bare vinyl gets hot in direct sun and sticks to skin, which the fabric-covered floats do not
  • Printed vinyl fades, because the color sits on the surface rather than in the material

Skip it if: Lasting. This is a consumable bought annually, and our float lifespan guide is clear that what kills one is storage rather than swimming. Treat the price as the price of a season.

What it costs to run: The honest comparison on this page is cost per season, not sticker price. At roughly a tenth of the luxury lounger, this float only has to survive one summer to win on arithmetic — and it usually does more than that if you keep it off hot concrete.

A few weekends: Fine for a heatwave and a toddler. Treat it as consumable, not as a pool — it will not survive a winter in the yard.

Specs from: Intex — King Kool Lounges, published weight limit, air chambers, deflated size and repair patch

Questions people actually ask

Are foam pool floats better than inflatable ones?
They fail differently, and that is the honest answer. An inflatable float dies from a valve leak or a split seam; foam has neither, so it dies from the vinyl coating breaking down and letting water into the foam. What makes foam easier to buy well is that the category publishes a thickness in inches, so two floats can be compared on a number. Our cheap against premium comparison found that no inflatable float at any price publishes a vinyl gauge - switching material class is the only way to get that spec at all.
What thickness of foam pool float should I buy?
The published ladder on this page is 1.25 in, 1.75 in and 2.5 in at the same 70 x 26 in footprint, and the published item weights climb with it: 7.3 lb, 9 lb and 14 lb. More foam means you sit higher out of the water, which is the entire experiential difference. If you divide price by published weight, the 2.5 in mat is the cheapest foam per pound of the three, so there is no value argument for buying the thinnest one unless the budget is fixed.
What weight can a foam pool float hold?
Nobody says. Not one foam float in this category publishes a weight capacity - the closest any of them comes is the California Sun listing's phrase “supporting most users”, which is not a figure. This is the exact mirror image of the inflatable category, where Intex publishes a 220 lb limit and two air chambers but no material thickness. Each class publishes the spec the other one withholds.
How do you store a foam pool float?
Flat, dry and out of the sun, which is the makers’ own published guidance rather than ours - the TRC listings say to “store flat and dry, away from extreme temperatures”. This is the real cost of foam: a 70 in mat does not deflate, fold or roll, so it needs a wall or a rafter. Our float storage guide makes the case that storage kills more floats than swimming does, and that applies to foam as much as to vinyl.
Can you use a foam float in a hot tub?
A saddle or a small foam pad, yes; a 70 in mat, no - it will not fit. The reason people ask is that foam is the only float material with no air chamber to expand, which makes it the sensible choice in hot water. If the real question is comfort in an inflatable tub, a weighted hot tub seat or headrest is the product for that job.

Sources