Sunbrella Advantage is a Sunbrella marine canvas sandwiched between a waterproof breathable coating on top and polyester knit underneath. This fabric is dimensionally stable due to the unique construction and is highly breathable yet waterproof. It is the perfect fabric for enclosures at the rear of a boat or for any space closed off by fabric requiring a circulation of air. Sunbrella Advantage is mold and mildew resistant and provides the superior colorfastness you expect from Sunbrella.