attwood Snug Harbor Silver Boat Cover, 150 Denier Polyester Snug Harbor covers are made from 100% polyester. This fabric is strong, color fast, and waterproof great for trailering and outdoor durability. Outstanding tear strength, burst strength and abrasion resistance. With any trailering cover it is most important to prevent wind bagging. Snug harbor covers include an adjustable elastic cord that runs the full length of the hem. This elastic adjusts at the bow and closes the cover to minimize wind entry Tie-down loops above the gunwale help keep the cover down while allowing the elastic hem to be pulled tight against tapered hulls Snug harbor covers have 1/2" poly webbing sewn across each cross seam to strengthen the cover for towing. Webbing also provides a stronger attachment point for the gunwale tie-down loops. Quality features and strong polyester fabric allow us to offer a 3-year warranty