SPA DOCTORS · Covers
Delivery · Relocation · Service
thrml AIRCAP inflatable cover installed on a hot tub

Your foam cover is a 150 lb sponge.
Replace it with air.

The thrml. AIRCAP 1™ — a foam-free inflatable hot tub cover built from welded drop-stitch, the same construction as inflatable paddleboards. It can’t waterlog, weighs 35–40 lb forever, and ships to your door in a regular box — no freight truck.

$1,395any size · free US shipping · 3-year manufacturer warranty
Need hot tub service, not a cover? Delivery · relocation · repair · maintenance — South Jersey. Full service site coming soon; we're one call away today.
(856) 266-7293
Never waterlogsNo foam core to soak up water — nothing inside for mold or mildew to grow in.
35–40 lb, foreverOut of the box and years later. One person handles it; works with most cover lifters.
Insulation that stays dryThe drop-stitch air core traps still air and holds heat — it can’t lose R-value to water.
Everything includedPump, three ZipTech™ skirt depths, four keyed locking tie-down straps.

Order yours

Measure the longest side across the top of your spa and pick the matching size. Square spas 77–94″. Same cover, same price, every size.

Secure checkout by Stripe. You’ll enter shipping and payment on the next page.
By purchasing you agree to our warranty & store policies — sizing is your responsibility, warranty is the manufacturer’s 3-year limited warranty.

See it in action

From thrml and independent reviewers.

How it works

  1. Measure the longest side across your spa's top, pick the size, check out.
  2. We place your order the same day.
  3. It ships free with tracking emailed to you — typically at your door within the week.
  4. Unbox, inflate with the included pump, done — about 15 minutes. Haul-away of your old foam cover available in our South Jersey service area, just ask.