Master Spas Challenger 21 Swim Spa Replacement Cover | Premium Swim Spa Covers Taper:6”-4” 5) closed cell foam that

5) closed cell foam that has a R27 insulation rating with over 20 colours to choose from

25 Hot Tub (84" × 70" w/5" skirt)

it requires no warning labels

Cover Thickness: 14 mil

Custom fit for Jacuzzi J-315 Hot Tub (76" × 66"with a 6" skirt)

Master Spas Challenger 21 Swim Spa Replacement Cover | Premium Swim Spa Covers Taper:6”-4” 5) closed cell foam thatCustom fit for Master Spas Challenger 21 Swim Spa (252" x 94" replacement cover available in three bi folds or sectional configurations w 5" skirt length) 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