Breathable Top Gun polyester. Use with the mast up. Large YKK zippers and snap closures around the forestay and shrouds; wrap tie seal around mast. Mid-cover main halyard attachment to "tent" the cover up prevents sag and water collection. 1/4 in shock cord in hem exits at the rear of the cover. The new style cover has built-in webbing cross-straps with adjustable, quick release buckles for a tight fit every time. This is the easiest and most secure cover attachment system available. Color: Gray (Navy Blue or Blue: 2-3 week special order).