Breathable Optimist top cover made of Moistureguard 2000, a heavy duty 900D polyester with a polyurethane membrane which has excellent breathability and is fairly water-resistant. The Optimist cover can be tented by storing the spars under the cover inside the boat. Wide skirts around the edge of the hull for good protection. Fast and easy to install with two straps with two adjustable quick-clip buckles.