Brightent Bimini Top 6 Different Size 3-4 Bow Boat Canopy Cover with Free Support Poles and Towel Clips The cover of this item is made of 600D woven polyester material with PU coating, MARINE GRADE, which is very good water-proof. And it has two aluminum rear support poles and a storage boot, free of charge! With 4 towel clips,made of high density nylon. Free of charge! Totally 6 different type/size.