Made of a heavy 6oz , 100% polyester. Imperial boat covers provide outstanding protection and strength. Treated for resistance to mildew, stains, and UV rays. These tough, trailerable covers have sewn-in elastic cord along the entire hem line for a snug,tight fit. Feature overlapping double-stitched seams, rotproof thread, quick release buckles with nylon web straps. Belt loops are sewn into the top of the cover to keep upper straps in place. Storage bag and tie down straps included. 5 year limited warranty.