LaserPerformance Covers: are made with Marchem Vista fabric, which is strong, durable, and resists water, mildew, UV and tears- arguably the highest quality marine fabric available. are sewn with Renara sewing thread by Gore, the highest quality thread available anywhere. incorporate padded corners, local reinforcements at critical wear points, sewn and top stitched lines, and "X" boxed stitching at all the tie-down strap attachment points. have open-ended, locking zippers guaranteed not to fail.