US Design Patented Cover is dual-coated and made out of heavy duty 24oz. marine-grade vinyl, with aircraft-grade aluminum frames, and comes with stainless steel clamps for easy installation and great durability. pre-assembled horizontal crossbars offer support and conveniently fold up with the cover providing full bed access when needed. Easy no drilling installation with instruction and mounting hardware provided. | NOTE: Small holes will need to be cut in the bedliner for vehicles equipped with over-the-bedrail bedliner to secure the clamps for proper cover installation; cover will work with under-the-bedrail bedliner without modification. LIMITED LIFETIME ! | IMPORTANT: Please measure your truck bed size before ordering. We accept returns; however customer will assume the return shipping cost if ordered wrong.