Premium Spa Cover Features High Quality Marine Grade Vinyl:With a weight of 30oz. (per lineal yard), the vinyl is the heaviest available. It also exceeds the specifications of "Marine Grade Vinyl", and "Premium Grade Vinyl". Steam Stoppers:Two Polystrene steam-stoppers keep the heat in. Corrosion Proof Zipper:Marine Grade extruded P.V.C. resin zipper able to withstand corrosion from chemicals and weather. Reinforced Hinge:Double Reinforced Folding Hinge. Metal C-Channel:The foam cores are further strengthened with a full Galvanized C-channel running the entire length of the cover. Full 4" to 2" Tapered Foam:5" to 3" tapered foam available. Super Strong Tie Down Straps:Four tie-downs with keyed lock fasteners provide a well safety rated spa cover. Heavy Duty Handles:Two heavy duty handles on each end of the cover. Breathable Underside Material:Breathable underside material allows water to dissipate and is Ozone, Chlorine and Bromine resistant. Vapor Heat Sealed Foam:Heat sealed foam vapor barrier insulation with an "R" value exceeding 15. Double Stitched:Commercial quality double-stitched for added strength.
