Made of superior quality 300-denier marine-grade polyester fabric, Covermate 300 Covers offer outstanding resistance to water, stains, UV, and mildew. Built to be strong, yet lightweight so it's easy to install and remove. The silver reflective fabric is designed to keep your boat cooler on hot summer days. Vented to prevent moisture and mildew build-up. Double-stitched double-ply seams add strength and durability. Reinforcement panels are sewn-in for long life. Quick-release buckles with web straps that run through loops over the top of the cover and down to the trailer. Sewn-in elastic shock cord.