This Rail Mounted Square Boat Umbrella is the next generation of the already popular Boat Umbrella from Magma. More than your ordinary umbrella, this Square Boat Umbrella has been manufactured for use in the harsh of marine environment. Made with non-corroding, fade resistant acrylic nylon materials, the windproof design will not allow the canopy to turn inside out or lose its shape in gusty wind conditions. The 100% UV block protective coating reduces the temperature under the canopy by 20°F, keeps you and your guests out of the harmful sun’s rays while the umbrella’s four corner tie-down securing points can be used with tie-down lines for extra support in windy conditions and the quick release round rail mount make adjustment easy in creating an extremely secure shaded area.