AIRCAP 1™ vs Airframe: Two Foam-Free Covers Compared (2026)
The AIRCAP 1™ and the Airframe are the two serious foam-free hot tub covers — and as far as we can find, nobody has compared them side by side. So here it is, from us, on published facts a reader can verify: construction, weight, price, safety claims, and warranty terms, with sources named.
Disclosure: we make the AIRCAP 1™. Every Airframe statement below comes from Coverplay's own published pages or named trade coverage, quoted as written in August 2026 — and we say plainly where the Airframe is genuinely strong.
Where the Airframe deserves real credit
The Airframe is a serious, proven product. It has been on the market since 2011–2012 (per AQUA Magazine's 2012 interview with its founder), holds five U.S. patents (listed on Coverplay's warranty page), and was designed by an engineer with genuine energy-efficiency credentials (AQUA Magazine profiled founder E. Jess Tudor's PG&E and Cal Poly testing work back in 2012). SpaRetailer reported in August 2026 that “many original Airframe covers still in service after more than 12 years,” and its modular build means components can be repaired or replaced rather than the whole cover discarded. It handles custom shapes and swim-spa covers by quote — territory the AIRCAP 1™ does not cover. And like the AIRCAP 1™, it solves the foam problem: nothing inside it absorbs water. If every foam cover buyer switched to either of these products, the industry's 3-to-5-year replacement treadmill would end.
Two ways to hold air
AIRCAP 1™: one welded, air-tight core
Thousands of internal polyester threads connect the top and bottom skins of a single welded drop-stitch chamber — paddleboard construction. Inflated, it holds rigid; sealed, nothing gets in or out. Published weight: 35–40 lb depending on size, permanently. Engineered to comply with ASTM F1346-23, with tie-down straps included.
Airframe: framed, vented air chambers
In Coverplay's words: “banded aluminum frames with radiant barriers creating layered air chambers,” covered in “acrylic, gas permeable fabrics.” Expanded air “is vented through pressure relief slits” in the underside — a breathing system rather than a sealed one, designed to prevent condensation buildup. Per Coverplay's care instructions, the fabric's water-repellency treatment is rated for up to two years outdoors, and they point owners to 303 repellent for re-treatment.
The numbers each maker publishes
| AIRCAP 1™ | Airframe | |
|---|---|---|
| Weight | 35–40 lb, published | “Lightweight” — no figure published |
| Price | $1,195 every size (77″–94″), pump + skirts + straps included, free continental-US shipping | $1,095 (up to 85″); $1,295–$1,594 (up to 93″) on Coverplay's store; “start at $995” per Airframe Aquatics; custom by phone |
| Cover lifter | None required; any lifter may be used | Sold with or without the $299 AIRS lifter, but “use of any unauthorized cover assist device voids the warranty” — only their AIRS keeps the warranty intact |
| Safety standard | Engineered to comply with ASTM F1346-23 | Homepage: covers “meet or exceed all ASTM safety standards”; their ASTM page reprints the 1991 revision (F1346-91), not the current F1346-23, and no test result is published; surface “not intended to be climbed on” (their warranty page) |
| Warranty | 3 years, original purchaser | 3 years, original registered owner, non-transferable (extended warranty offered at purchase; AIRS lifter 7 years); excludes the underside vapor barrier; warranty freight not included |
| Sizing | Six sizes, 77″–94″ square; 284 models pre-matched in the Spa Fitter | Two listed tiers (up to 85″ / up to 93″); custom shapes and swim-spa covers by quote |
| Care | Rinse; no re-treatment schedule | Water-repellency rated up to two years outdoors; 303 re-treatment available (their care instructions) |
How to choose
If you have a round, odd-shaped, or swim spa, the Airframe's custom program is the option between these two. If you have a square spa from 77″ to 94″ — most hot tubs — the choice comes down to what you can verify: the AIRCAP 1™ publishes its weight, names its safety standard and revision, includes everything in one listed price, and requires no proprietary lifter. Whichever way you go, foam-free is the right category, and we would rather you buy an Airframe than another foam cover.
Find your spa in the Spa Fitter, see every foam-free construction compared, or choose your AIRCAP 1™ size. Related: AIRCAP vs SpaCap · all alternatives compared
Frequently asked questions
Is the Airframe spa cover foam-free?
Yes. The Airframe uses banded aluminum frames with radiant barriers forming layered air chambers under an acrylic fabric — no foam, so no water absorption. Our AIRCAP 1™ is also foam-free, using a welded drop-stitch air core instead. The two are the leading foam-free constructions; they differ in how the air is held and what each maker publishes about the result.
What is the difference between the AIRCAP 1 and the Airframe?
Construction, and what each maker publishes. The AIRCAP 1™ is a single welded, air-tight drop-stitch core — inflated rigid, published weight of 35–40 lb, engineered to comply with ASTM F1346-23. The Airframe is aluminum frames and radiant barriers forming air chambers, vented by design, under gas-permeable acrylic fabric; its maker describes it as lightweight but publishes no weight figure.
How much does each cover cost?
Our AIRCAP 1™ is $1,195 in every size (77″–94″), including the pump, three Ziptech™ skirt depths, and tie-down straps, with free continental-US shipping. Coverplay's store lists the Airframe at $1,095 for covers up to 85″ and $1,295–$1,594 for covers up to 93″ (the Airframe Aquatics site advertises prices starting at $995), with custom shapes by quote. The cover is sold with or without Coverplay's $299 AIRS lifter, but only the AIRS may be used with the warranty intact — “use of any unauthorized cover assist device voids the warranty.”
Which cover is safer?
Compare the published claims. The AIRCAP 1™ is engineered to comply with ASTM F1346-23, the current safety-cover standard, and locks down with tie-down straps. Coverplay's homepage states that Airframe covers “meet or exceed all ASTM safety standards”; its ASTM page reprints the 1991 revision of the standard (F1346-91) rather than the current F1346-23, no test result is published, and its own warranty page says the cover has a pliable surface and is not intended to be climbed on. Whichever cover you consider, ask the maker for the standard revision and the test in writing — we will put ours in writing on request, and you should demand the same of any maker.
Which cover lasts longer?
Both carry 3-year warranties to the original owner (Coverplay also offers an extended warranty at purchase, and its AIRS lifter carries 7 years). The Airframe has real longevity history — SpaRetailer reported in 2026 that many original Airframe covers are still in service after more than 12 years, and its modular parts can be repaired or replaced. The AIRCAP 1™'s durability case is its construction: a welded core with no foam to waterlog, no threads in the weather, and no hinge hardware, so its day-one weight and insulation are its weight and insulation for as long as it is on the spa.
How long does an Airframe spa cover last?
By the published record, a long time: SpaRetailer reported in August 2026 that many original Airframe covers are still in service after more than 12 years — well past its 3-year warranty. No maker publishes a tested lifespan for any air cover. What can be said structurally is that neither the Airframe nor our AIRCAP 1™ contains foam, so neither has the waterlogging failure that ends most foam covers within 3–5 years.