Master Spas Challenger 18 Swim Spa Replacement Cover | Swim Spa CoversCustom fit for Master Spas Challenger 18D Swim Spa (215" x 94" replacement cover available in two bi fold 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
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