Traditional round fenders tend to roll up from contact with docks, leaving your boat unprotected. They're also bulky to stow. Boats with step-down gunwales are especially vulnerable to damage from docks. HULL HUGR Contour Fenders stay put and stow conveniently under boat seats. They hinge to wrap around the gunwale and hull, following the contours of the boat. All HULL HUGRs are constructed with a tough marine grade rip proof tri-laminate cover, with closed cell foam inside. Durable polycarbonate grommets at each end allow you to hang them from cleats.