MSC Heavy Duty 600D Marine Grade Polyester Canvas Trailerable Waterproof Boat Cover,Fits V-Hull,Tri-Hull, Runabout Boat Cover Made of marine grade polyester canvas with double PU Coating Designed for both long-term storage, mooring and highway travel Resistant to mildew and UV damage Includes adjustable straps and storage bag; 3 Year limited warranty Recommend to use with boat cover support poles