Heavy-Duty 600 Denier Jet Ski Personal Watercraft PWC Cover for Sea Doo Sea-Doo RXP-X 300 2016 17 2018 600 DENIER, HEAVY-DUTY JET SKI COVER. DESIGNED FOR: STORAGE, TRAVEL and MOORING purposes. Technologically advanced 600 DENIER Heavy-Duty Marine Grade Poly fabric for the best sun, rain, dirt, mildew protection. Air vents reduce inside moisture and wind lofting. Elastic cord sewn into bottom hem for a fast, snug fit. COLOR: 2 Tone: Black /Grey