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 resistanceNo foam core to waterlog, a light 35–40 lb. Fits square Tropic Seas Spas models 77″–94″ across the top. $1,195 with free shipping, usually at your front door within 3–5 business days.
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3-year limited warranty · In 100+ hot tub showrooms
Browse all 7 Tropic Seas Spas models
AIRCAP 1™Made for a lighter lift.
Watch it open and close on a cover lifter
7 Tropic Seas Spas models
Find your model.
See your size.
The AIRCAP 1™ fits seven of the thirteen Tropic Seas hot tubs — every square shell in the range, on two footprints. Find your model below and click Buy Now to get the right size.
Every AIRCAP 1™ size is $1,195 with free shipping to all 50 states — usually arrives in 3–5 business days.
Don't see your model?
Use our SureFit™ easy-measure guide to find the right AIRCAP 1™ cover for any square hot tub from 77″ to 94″.
Need help? Contact thrml. to confirm your fit before you order.
Have a different brand? See all spa brands
What customers are saying
Awesome product, my kids don’t complain about the cover anymore…
Best $$ I ever spent!
What this company has created in terms of an original and revolutionary product is nothing short of amazing.
For a reasonable price, I can cover my spa with a top that won’t get musty.
Nice and lightweight
…set up was super easy and took about 15 min total.
Installation was a breeze and we love it already!
Great customer service still matters, and frankly, not enough companies deliver it anymore. This company does, and that deserves recognition.
Do not wait to buy one.
01 / 09
Thoughtfully engineered
Built to solve the
problems of foam.
Three practical reasons to rethink your next hot tub cover.
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 insulatesReplaceable 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 worksEvery 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 works3-year limited warranty
Backed by a three-year limited warranty against manufacturing defects.
Warranty detailsFit assistance
Use Spa Fitter™ or SureFit™, or contact us before you order and we will confirm your size.
Get fit helpSizing FAQ: which AIRCAP 1™ fits your Tropic Seas Spas?
What size hot tub cover fits a Tropic Seas Spas Waikiki 864L (Waikiki Elite 861L DB)?
The Tropic Seas Spas Waikiki 864L (Waikiki Elite 861L DB), which measures about 91" x 91", takes the AIRCAP 1 Large, which fits square hot tubs measuring 89 to 91 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Oahu 864B (Oahu Elite 859B DB)?
The Tropic Seas Spas Oahu 864B (Oahu Elite 859B DB), which measures about 91" x 91", takes the AIRCAP 1 Large, which fits square hot tubs measuring 89 to 91 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Maui 851L?
The Tropic Seas Spas Maui 851L, which measures about 91" x 91", takes the AIRCAP 1 Large, which fits square hot tubs measuring 89 to 91 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Fiji 851B?
The Tropic Seas Spas Fiji 851B, which measures about 91" x 91", takes the AIRCAP 1 Large, which fits square hot tubs measuring 89 to 91 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Kona 751B?
The Tropic Seas Spas Kona 751B, which measures about 84" x 84", takes the AIRCAP 1 Small, which fits square hot tubs measuring 83 to 85 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Rio 751L?
The Tropic Seas Spas Rio 751L, which measures about 84" x 84", takes the AIRCAP 1 Small, which fits square hot tubs measuring 83 to 85 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size hot tub cover fits a Tropic Seas Spas Makai 727L?
The Tropic Seas Spas Makai 727L, which measures about 84" x 84", takes the AIRCAP 1 Small, which fits square hot tubs measuring 83 to 85 inches across. Measure your spa side to side across the top of the cabinet to confirm the size before ordering.
What size AIRCAP 1™ fits your Tropic Seas hot tub?
Tropic Seas Spas are built by May Manufacturing in Las Vegas, Nevada. Four models share one 91" × 91" footprint — the Waikiki 864L, Oahu 864B, Maui 851L and Fiji 851B (L is the lounger layout, B the bench) — and take the AIRCAP 1™ Large (fits 89"–91"). The dual-foot-jet versions, the Waikiki Elite 861L DB and Oahu Elite 859B DB, are also 91" × 91" and take the same Large; Tropic Seas has offered dual foot jets on the Waikiki and Oahu since at least 2017, when the option was called the Dual Footblaster. The Kona 751B and Rio 751L, and the 110-volt plug-and-play Makai 727L, are 84" × 84" and take the Small (83"–85"). Standard and Elite trims share footprints, so one size covers both.
Six Tropic Seas models are rectangles and no AIRCAP 1™ size will fit them: the Tahiti 965L (108" × 91", the same size as its dual-foot-jet version, the Tahiti Elite 961L DB), the Kawai 745L and Hawaii 735L (84" × 78" — close, but six inches off square), the Lanai 531L and Hana 521L (84" × 61") and the Tonga 527B (78" × 60"). In a Tropic Seas model number the last two digits match the jet count (the 864L has 64 jets, the 861L DB 61), and the first digit is not a reliable guide to size: a leading 7 does not mean an 84" square — the 745L and 735L are 84" × 78". The Tropic Pool is a 168" × 91" swim spa. Tropic Seas’ own Weather Guard cover is a conventional foam cover with a fabric skin.
Dimensions are taken from the Tropic Seas product pages and the 2026 brochure, which agree on every model (September 2026). Cabinet sizes can change between model years, so measure your spa side to side across the top of the cabinet before ordering; the SureFit™ measuring guide walks through it in two measurements. If your measurement falls between two sizes, round up.
Your cover. Your way.
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$1,195 with free shipping, usually at your front door within 3–5 business days.
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Available in over 120 authorized hot tub showrooms across 34 states.