Manufactured for use in the harshest of marine environments, this windproof cockpit umbrella is made with non-corroding, fade-resistant acrylic nylon materials. The special design prevents the canopy from turning inside out or losing its shape in gusty winds while the 100% UV block protective coating reduces the temperature under the canopy by 20! It featuresfour corner tie-down attachment points, aquick-release round rail mount that makes adjustments a snap, fiberglass bow ribs that wont rust or stain the fabric, and a doubled-cored, flexible fiberglass main shaft for added strength. Umbrella measures 6ft. across the bow with a 5 ft. fiberglass shaft assembly. The 7/8” or 1” round rail mount is made of 18-8 stainless steel and 365 anodized aluminum that adjusts to fit any angle on vertical stanchions or horizontal railings. Quick-release round rail mount detaches without tools leaving no hardware on the rail. Two year limited warranty.