Spa Fitter

Find your replacement hot tub cover

If your hot tub is square and measures 77″–⁠94″ across the top, an AIRCAP 1™ fits it, even if your model isn't listed.

Measure it and we'll tell you the size:

or

Know your model? Get its dimensions and cover size.

Type the brand and model, or the measurement across the top of your spa.

Fits about 90% of square hot tubs. Not listed? Pick your brand below, or use the two-step measuring guide.

Not on our list? If your hot tub is square and measures 77″–⁠94″ across the top, an AIRCAP 1™ still fits it. Enter both sides above.

$1,195 with free shipping to all 50 states.

In 100+ hot tub showrooms · Engineered to comply with ASTM F1346-23

Browse all 60 brands
AIRCAP 1 hot tub cover on a square spa
AIRCAP 1™Six sizes for square spas 77″–94″
  • Quick delivery Usually at your door within 3–⁠5 business days
  • Fits square spas 77″–⁠94″ across the top
  • Light, no foam 35–⁠40 lb, out of the box and years later
  • Free 30-day returns Plus a 3-year limited warranty
  • $1,195, any size Free shipping to all 50 states
  • Works with most cover lifters Confirm your lift
  • Quick delivery: usually at your door within 3–⁠5 business days
  • Fits square spas 77″–⁠94″
  • 35–⁠40 lb, no foam
  • Free 30-day returns
  • $1,195, free shipping

3-year limited warranty · Works with most cover lifters: confirm your lift

Pick your brand.
Find your model.

Brand or model not here? If your hot tub is square and measures 77″–⁠94″ across the top, an AIRCAP 1™ still fits it.

Get your size by measurement

Six sizes · square spas 77″–⁠94″

Already measured? Get your AIRCAP.

Six sizes fit square hot tubs from 77″ to 94″ (about 90% of square hot tubs). Listed model or not, tap your measurement across the top:

Measure across the top of your spa, side to side. Each size goes straight to the AIRCAP 1™ that fits it. Not sure? The two-step measuring guide places any square spa from 77" to 94".

Don't see your brand or model?

Listed or not: if your hot tub is square and measures 77″–⁠94″ across the top, an AIRCAP 1™ fits it.

Use our SureFit™ easy-measure guide to find the right AIRCAP 1™ cover for any square hot tub from 77″ to 94″.

Measure your spa SureFit Guide

Need help? Contact thrml. to confirm your fit before you order.

What customers are saying

Awesome product, my kids don’t complain about the cover anymore…
— Neil · Verified buyer
01 / 09

Thoughtfully engineered

Built to solve the
problems of foam.

Three practical reasons to rethink your next hot tub cover.

Water-resistant & lightweight

AirLoc™ panels have no foam core to soak up water, so the cover weighs the same out of the box and years later: 35–40 lb, depending on size.

Learn about water resistance

Consistent insulation

The sealed AirLoc™ air core has nothing in it to absorb water, so its insulation stays consistent for the life of the cover.

See how AIRCAP insulates

Replaceable skirt system

Three ZipTech™ skirt depths come in the box, and a worn or damaged skirt can be replaced on its own, without replacing the whole cover.

See how ZipTech works

Every detail matters

Purchase with confidence.

30-day returns

Fits or we make it right. Wrong size or changed your mind? Swap it or return it within 30 days of delivery. We send a prepaid return label and there’s no restocking fee. Covers must come back in like-new condition with all parts. Bought from an authorized retailer? That retailer’s return policy applies.

How the fit guarantee works

3-year limited warranty

Backed by a three-year limited warranty against manufacturing defects.

Warranty details

Fit assistance

Use Spa Fitter™ or SureFit™, or contact us before you order and we will confirm your size.

Get fit help

A better way to replace your hot tub cover

Most replacement hot tub covers are the same 40-year-old design: a foam core wrapped in vinyl. Over time the foam can take on water, the cover gets heavier, and you're back to shopping for another one. The AIRCAP 1™ is different — a lightweight hot tub cover built with welded drop-stitch construction, the same technology used in rigid inflatable paddleboards. Because there's no foam core, it's a spa cover that doesn't absorb water: it weighs 35–40 lbs on day one and weighs the same years later.

Finding your replacement spa cover is simple. Pick your brand above and match your model, or measure your spa with SureFit™ — two measurements is all it takes. Six sizes fit square hot tubs from 77" to 94", each with three zip-on skirt lengths for a semi-custom fit, and your cover installs in about 10–15 minutes.

Listed or not

Square and 77″–⁠94″ across the top?

If that's what your tape measure says, an AIRCAP 1™ fits it, even if your model isn't listed. $1,195 with free shipping to all 50 states.

Measure your spa

Know your model? Search the Spa Fitter.

Not sure how to measure? SureFit Guide.

Prefer to shop locally? Find one of 100+ showrooms.

Available in over 120 authorized hot tub showrooms across 34 states.