Boat UmbrellaBoat Umbrella 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 umbrella shade reduces the temperature under the canopy, keeping you and your guests out of the harmful suns rays while the four corner