Core Covers CVR84x84BN Spa Cover, 84" x 84" x 4", Vinyl Bourbon 30 oz. Marine Grade mildew and UV resistant vinyl, tested not to crack to -20F and 20 gauge non-corrosive Steel center Bar to prevent sagging from heavy snow and with 37 stress Point Reinforcements Tapered 1.5 lb. Virgin foam is 25% denser adding greater insulation and lower operational cost. 6 mil double-ply industrial Grade heat sealed to give twice the moisture and chemical protection Exclusive state of the art vacuum core insulation moisture heat seal technology to against heat escape and sturdy reinforced 4 layer hinge with super strength recessed handles Reinforced locking straps and hidden design, corrosion resistant zipper, Premium split corners are dual reinforced to seal the heat in and cover is weight rated to 300 lbs. Of static weight from snow 3 Year Bumper to Bumper non-pro rated Warranty