Budge 600 Denier Boat Cover fits Hard Top/T-Top Boats B-621-X4 (16' to 18' Long, Gray) MARINE GRADE PROTECTION: Waterproof to repel snow, hot sun and heavy rain, the 600 denier polyester material is UV treated for maximum sun and heat protection to protect your boat's upholstery and paint WATERPROOF AND BREATHABLE: Material designed to prevent condensation build-up and reduce rust, mold and mildew BUILT TO STAY SECURE: Heavy shock cord hem gives cover a semi-custom fit. Sewn-in straps make it exceptionally durable when trailering, so you can tow your boat to the shore without having to worry SIZED TO FIT: Our custom-like design Budge 600 Denier Boat Cover fits Hard Top / T-Top Boats. This boat cover fits hard top / t-top boats 16'-18' (192"-216") Long, beam width up to 106"