SureFit™

What size hot tub cover do I need?

Measure straight across the top of your spa, edge to edge, both ways — then match the larger number to a size below. Square spas from 77" to 94" are covered by six sizes: 77–79" takes the XX-Small, 80–82" X-Small, 83–85" Small, 86–88" Medium, 89–91" Large, 92–94" X-Large. Land between two sizes? Round up.

in

That is the whole job. Unlike foam covers, which need a corner radius, a foam density and a skirt depth before anyone can quote you, the AIRCAP 1™ needs those two numbers and nothing else.

  • 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

Find your size Buy Now
Measure your hot tub side to side across the top
  1. 1

    Measure your spa

    No radius or foam-density guesswork. Just measure straight across the top of your spa, edge to edge, both ways.

  2. 2

    Match it to a size

    Find the size range your measurement falls into below and click Buy Now. That’s it — we handle the rest.

We currently manufacture square covers for spas between 77" and 94".

Already measured? Get your AIRCAP.

Measure across the top of your spa, side to side. Each size goes straight to the AIRCAP 1™ that fits it.

Sizing questions, answered

What size hot tub cover do I need?

Measure straight across the top of your spa, edge to edge, in both directions, then match the larger number to a size. On the AIRCAP 1 that is: 77 to 79 inches takes the XX-Small, 80 to 82 the X-Small, 83 to 85 the Small, 86 to 88 the Medium, 89 to 91 the Large, and 92 to 94 the X-Large. If your measurement lands between two sizes, round up.

How do I measure my hot tub for a replacement cover?

Measure straight across the top of your spa, edge to edge, in both directions. The AIRCAP 1 needs only those two numbers — no corner radius, foam density or skirt depth to look up. Match the larger of the two measurements to the size ranges on this page.

What sizes does the AIRCAP 1 hot tub cover come in?

Six sizes, covering square spas from 77 to 94 inches: XX-Small fits 77 to 79 inches, X-Small 80 to 82, Small 83 to 85, Medium 86 to 88, Large 89 to 91, and X-Large 92 to 94.

Are hot tub covers a standard size?

No. Cabinet dimensions vary between manufacturers, and between model years of the same spa, which is why covers are sold by measurement rather than one universal size. About 90% of square hot tubs measure between 77 and 94 inches across. Measure your own spa rather than assuming the size of the cover you are replacing was correct.

What if my hot tub measurement falls between two cover sizes?

Round up to the larger size. A cover that is slightly oversized overhangs by a fraction of an inch, which is how a spa cover is meant to sit. An undersized cover comes up short and will not seal along the edges.

Do I need to measure the corner radius of my hot tub?

No. Traditional foam covers need a corner radius because they are rigid, but the AIRCAP 1 does not. Two straight measurements across the top of the spa are enough.

Will an AIRCAP 1 fit a round or rectangular hot tub?

Not currently. The AIRCAP 1 is manufactured for square spas between 77 and 94 inches. Round, rectangular and swim-spa cabinets fall outside that range.

If the cover you're replacing failed early

Know your spa brand and model?

Skip the tape measure — look your model up directly in the Spa Fitter.

Open Spa Fitter