Product Description

Master Spas Challenger 21' Replacement Cover – 257" x 94" Two-Bi-Folds  or Sectionals

Protect your swim spa with a premium replacement cover designed for the Master Spas Challenger 21 swim spa. Built for durability and insulation, this cover helps maintain water temperature while protecting your spa from debris, weather exposure, and everyday use.

Featuring high-density tapered foam insulation, this replacement cover helps reduce heat loss and improve energy efficiency. Maintaining consistent water temperature helps reduce operating costs while keeping your swim spa ready to enjoy.

The exterior features marine-grade vinyl and Atlantis Pro-Tex performance fabric, designed to withstand harsh outdoor conditions including UV exposure, moisture, and seasonal weather changes.

Designed specifically for the Master Spas Challenger 21 swim spa, this replacement cover provides dependable protection and insulation.




Product Features

✔ 4 mil standard vapour barrier to reduce moisture absorption and help prevent foam waterlogging

✔ 1.5 lb high-density polystyrene foam core for strong insulation and long-term structural support

✔ Adjustable locking straps that meet ASTM safety standards, including all required mounting hardware for easy installation

✔ Steam stoppers along the hinge to improve heat retention and reduce energy loss

✔ Optional upgrades available for enhanced insulation, durability, and overall performance

Warranty

At The Cover Brothers, we proudly stand behind the quality and craftsmanship of our products with a 4-year pro-rated warranty. This coverage protects against defects in materials and workmanship throughout the warranty period, giving you confidence in your investment.

While repairs are not complimentary, our pro-rated structure ensures fair, cost-effective solutions should an issue arise — supporting the long-term performance and value of your cover.

For complete details on coverage, terms, and conditions, please refer to our full warranty policy.

Shipping & Returns

All sales with The Cover Brothers are final, as each cover is custom-built to order and we do not accept returns. To ensure you receive the correct product for your needs, we strongly encourage reviewing all specifications and measurements carefully prior to purchase.

Our team is always available to assist with any pre-purchase questions to help guarantee the best possible fit and configuration for your spa. If you experience any concerns with your order, please contact our customer support team and we will be happy to assist you.

Master Spas Challenger 21 Swim Spa Replacement Cover | Premium Swim Spa Covers

Master Spas Challenger 21 Swim Spa Replacement Cover | Premium Swim Spa Covers

-- --
Skip to product information
1 of 2
Made in Canada
4 Year Prorated Warranty
  • Custom fit for Master Spas Challenger 21 Swim Spa (252" x 94" replacement cover – available in three bi-folds or sectional configurations)
  • High-density foam insulation (1.5 lb density) for superior heat retention and improved energy efficiency
  • Available in marine-grade vinyl or Atlantis Pro-Tex performance fabric for long-lasting durability and weather resistance
  • Reinforced hinge seal for added strength and extended cover life
  • Heat-sealed vapor barriers to help prevent moisture absorption and foam saturation
  • Chemical-resistant liner for improved durability and protection against spa chemicals
  • Durable reinforced handles for easy lifting and cover removal
  • Adjustable locking safety straps that meet ASTM safety standards, including all required mounting hardware for easy installation
  • Optional upgrades available for enhanced durability, insulation, and customization 

Need a different shape/size?  customize cover here!

Have additional questions? 1-844-799-0071

1
Select Taper*
3
Select Color*
Standard Colors
Our Upgraded Atlantis Colours
The Atlantis colours are 25% lighter more durable have added UV protection and extra mildew inhibitors and look really sharp!
Color:
Select Handles*
Cap Cover
Select Cap Colours
Color:
×
4
Upgrades & Accessories
Total
$569.99
Add To Cart