ULTCOVER Waterproof Square Hot Tub Spa Cover 90" — 600D Polyester, Elastic Hem & Vents

ULTCOVER's 90-inch waterproof square hot tub SPA cover is a durable, weatherproof outer cover designed to shield square hot tubs up to 90" from rain, snow, leaves, and debris when used over an insulated hard cover.

This ULTCOVER exterior cover adds an extra barrier against the elements for square hot tubs and spas up to 90 inches. Constructed from heavy-duty 600D polyester with a waterproof backing, it’s made to resist moisture, dirt and common outdoor wear. Built-in air vents and an adjustable elastic cord help keep the cover secure and reduce wind lift, while the full-coverage design protects the visible surfaces of your tub so it stays cleaner and more presentable between uses.

How does this cover protect my hot tub from weather and debris?

The cover’s 600D polyester fabric with a waterproof backing repels water, dust, and organic debris so moisture and grime don’t accumulate on your spa’s exterior. It’s intended to be used over an insulated hard cover, providing a secondary shield that prevents leaves, bird droppings, and hail from contacting the surface beneath.

• Waterproof laminated backing blocks rain and melting snow.
• Thick polyester face resists tears from branches and grit.
• Full-coverage fit reduces sun exposure and fading.

Will the cover stay in place during wind or bad weather?

Yes — the design includes heavy-duty elastic cords that cinch the cover down for a snug fit, plus structured side vents that relieve pressure from gusts. Together these features reduce lift and keep the cover from flapping or blowing off in typical wind conditions.

• Elastic hem cord adjusts for a tight fit around the skirt.
• Two-sided air vents equalize pressure and lower wind stress.
• Durable stitching and construction resist strain at anchoring points.

How straightforward is setup and daily use?

The cover is lightweight enough for one or two people to place over a 90" square spa and slips on easily thanks to the elasticized hem. Maintenance is minimal: rinse or wipe clean, and the waterproof surface sheds most grime so you spend less time cleaning and more time enjoying your tub.

• Elastic cord enables quick mounting and removal.
• Wipeable surface for fast cleanup of dirt and droppings.
• Designed to sit over an insulated hard cover — not as a stand-alone thermal barrier.

What size and compatibility details should I check before buying?

This ULTCOVER is built for square hot tubs up to 90 inches in length and width; confirm your tub’s outer dimensions before ordering. Note that this outer cover does not provide insulation by itself and must be used with an insulated hard cover under it to maintain thermal performance.

• Fits square tubs up to 90" (L) x 90" (W).
• Not a replacement for an insulated cover—intended as weatherproof outer protection.
• Check skirt clearance and mounting space for the elastic cord to secure properly.

Who is this for: The ULTCOVER 90-inch waterproof square hot tub SPA cover is ideal for spa owners who already use an insulated hard cover and want an easy-to-install outer shield against harsh weather, falling debris, and UV exposure. It suits anyone looking for a durable, low-maintenance protective layer to keep their spa exterior cleaner, reduce cosmetic wear, and help their existing cover last longer.