Sharkskin is a specially formulated polyester that weighs only 6.5 oz. per square yard. Still incredibly strong and durable, this cover provides outstanding protection for boats by repelling water, mildew, UV rays, and other foreign elements. Fade-resistant, breathable finish resists staining and prolongs cover life. 5-year limited warranty. Orders for Covermate Exact-Fit Covers cannot be canceled and are non-returnable and non-refundable. If you need help selecting the correct Exact-Fit Cover for your boat, please use our Live Help or call us at 1-888-OVERTON, and we will be happy to assist you. Please have your boat year, make, and model available. This cover is for Shockwave 28' Deckboat I/O Bimini On Short Strut Trailerable: Yes Material: 6.5 oz. 100% polyester | Covermate Exact Fit Sharkskin Boat Cover For Shockwave 28' Deckboat I/O Bimini On Short Strut in Linen | Polyester