T-Top/Hard Top Boats - Eliteshield 600 Boat Covers Superior 1200 denier polyester fabric. Won't shrink or stretch. Double stitched seams with rot-proof threads provide added strength and water resistance. Reinforcements sewn (not glued) at all major wear points. Superior breathability ensures air circulation and protects against mildew, dampness and musty odors. Treated with advanced UV inhibitors for protection against harmful UV rays.