Kawasaki Mule Transport Bed covers are made from 500 denier waterproof Cordura and use Velcro and clips around outer edge to attach under bed rail. Supplied adhesive backed Velcro is used so tailgate can be raised and lowered without removing cover. Note: Items in black are made of 40 ounce Tonneau-Tex Vinyl. Specify 3010 or 4010 series when ordering.James Greene Products