ULTCOVER Waterproof 600D Polyester Square Hot Tub Cover 85 x 85 in

In this review of the ULTCOVER waterproof 600D polyester square hot tub cover, the bottom line is simple: it is a practical, affordable outer cover for owners who already have an insulated hard spa cover and need reliable all-weather protection. The cover is designed to fit tubs up to 85(L) x 85(W) and its main selling point is durable waterproof fabric combined with adjustable fit features that keep rain, leaves and bird droppings off your spa without adding insulation. For anyone seeking a sturdy outer barrier against storms and sun exposure, this cover delivers clear value.

Key Features

• Size fit: Designed to fit hot tubs up to 85(L) x 85(W), giving full top and skirt coverage for many common square spas.
• Waterproof 600D fabric: The 600D polyester canvas with waterproof backing sheds rain, hail and snow to keep the insulated cover and spa surface dry.
• Structured side vents: Two well-made air vents promote ventilation, reduce lift in wind and help prevent trapped moisture under the cover.
• Heavy duty elastic cords: Elastic cords allow a snug, adjustable fit that helps keep the cover in place during high winds and severe weather.
• Full coverage design: The extended skirt protects the sides from sun exposure and keeps the spa looking newer by blocking UV and debris.

Who It's For

The ULTCOVER outer spa cover is best for homeowners who already use an insulated hard cover and want an additional waterproof layer to protect that primary cover from the elements. It suits users who need a budget-friendly, easy-to-install solution to keep rain, leaves and bird droppings off their spa and to reduce sun fading of the underlying cover.

It is not a replacement for an insulated cover and should not be relied on as the sole thermal barrier; shoppers who need integrated insulation or a one-piece thermal cover should look for a purpose-built insulated spa cover instead.

Pros & Cons

Pros

• Durable 600D polyester construction provides strong waterproof protection against rain and snow.
• Structured vents and elastic cords reduce lift and help maintain a secure fit in windy conditions.
• Full coverage skirt shields sides from sun and debris, keeping the spa and underlying cover cleaner.

Cons

• Not designed to be used alone as an insulated cover, so buyers must already have a hard insulated cover beneath it.
• Some users report fading or wear over time, so longevity can vary with exposure and use.

Specifications

Brand	ULTCOVER
Material	600D polyester canvas with waterproof backing
Fits up to	85(L) x 85(W) in
Vents	Structured air vents on two sides
Closure	Heavy duty elastic cords for adjustable fit
Coverage	Full coverage skirt to protect sides

Our Verdict

The ULTCOVER 600D outer hot tub cover is a sensible, cost-effective choice for spa owners who already have an insulated hard cover and want extra weather protection. It protects against rain, debris and sun exposure, fits large square tubs up to 85 in, and offers adjustable fastening and vents that reduce lift. While it is not a replacement for insulation and longevity can vary, it is good value for the protection it provides.

Frequently Asked Questions

Can this cover be used by itself?
No. This product is an outer waterproof cover and should not be used alone; it must be paired with an insulated hard cover underneath.

Will it keep rain and leaves off my spa?
Yes. The 600D polyester with waterproof backing and full coverage design sheds rain and blocks leaves and bird droppings from the spa and insulated cover.

How does it perform in wind?
The structured side vents and heavy duty elastic cords help prevent the cover from being blown away and allow a tighter fit in windy conditions.