Fully padded bottom cover for the best protection of your Optimist hull. The padding protects your Optimist from your surroundings (for example, paved surfaces and rough handling). This makes the bottom cover great for sailors who travel frequently. Pull and tie the cover around the hull with the heavy-duty loop line and tighten the cover with the three quick-release buckle straps.Material600D polyester with 420 PU coating190T interlining inside and closed cell foam in between