Magma Jet Black Cockpit Umbrella The Magma Cockpit Umbrella is a square-design umbrella manufactured for use in the harshest of marine environments. 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. Canopy is reinforced to each corner die-down point with polyester webbing. The canopy is stretched over specially designed fiberglass bow ribs that will not rust or strain the f