AIRCAP 1™ vs SpaCap: Two Generations of the Air Cover
If you're comparing the AIRCAP 1™ against the SpaCap, you've already made the important decision: no more foam. Both covers exist because foam cores absorb water, get heavy, and fail on a 3–5 year clock. Where they differ is how they put air to work — and the difference is generational.
A note before comparing: as of August 2026, spacap.com shows a domain-parking page and we could find no active ordering channel. We've kept this comparison factual and based on SpaCap's published design; if their availability changes, we'll update.
Two constructions, one principle
SpaCap's approach (1980s-era design): a sewn fabric shell — offered in premium outdoor fabrics — containing loose air bladders, from two up to five. No foam anywhere, so nothing to waterlog. But sewn seams and separate bladders mean the cover drapes rather than spans: it follows the water line, can pool rain in low spots, and relies on the bladders staying put and staying inflated individually.
AIRCAP's approach (paddleboard-era design): a single heat-welded, UV-resistant PVC drop-stitch panel. Drop-stitch means thousands of internal threads connect the top and bottom skins, so at pressure the panel becomes rigid — the same reason an inflatable paddleboard can hold a standing adult. One chamber, no seams to wick, a true span across the spa that sheds water, framed by the Ziptech™ modular skirt for a semi-custom fit.
Side by side
| SpaCap | AIRCAP 1™ | |
|---|---|---|
| Air containment | 2–5 loose bladders in a sewn shell | Single welded drop-stitch panel |
| Rigidity | Soft — drapes on the water line | Rigid when inflated — spans the spa |
| Rain and snow | Can pool in low spots | Sheds — no sag to collect it |
| Foam to waterlog | None | None |
| Weight over time | Stable | Stable — 40–45 lb, day one to year five |
| Safety standard | Not advertised | Engineered to comply with ASTM F1346-23 |
| Fit | Custom-made, any shape | Six sizes, square spas 77″–94″ |
| Price | From ~$500 + upgrades (historical) | $1,195, three-year warranty |
| Availability | Website offline as of Aug 2026 | In production, ships from stock sizes |
Where SpaCap genuinely had the edge
Fairness matters: SpaCap's made-to-order model fit any spa — round, octagonal, in-ground. The AIRCAP 1 is engineered for square spas from 77″ to 94″. If your tub isn't square, see our guide to SpaCap alternatives for the options that still fit your shape.
The bottom line
SpaCap proved, over decades, that hot tub owners would happily trade foam for air. The AIRCAP 1™ is what that idea looks like rebuilt with modern materials: welded instead of sewn, one rigid panel instead of loose pillows, a safety standard on the spec sheet, and a three-year warranty behind it. If your spa is square, find your size in the Spa Fitter — it takes about a minute.
Want the full landscape? Our complete guide to hot tub cover alternatives compares all six options.