Mission Sentry 2.0 Boat Fenders The new and improved Mission Sentry 2.0 boat fenders features a smart attachment system and hugs the contours of the hull. Fenders quickly attach to boat cleats and docks, and provide protection both above and below the rub rail. However, Mission Sentry Boat Fenders are unlike traditional fenders. An innovating hanging system enables them to be positioned on a boat or dock more easily. Sentry fenders hanging point is lower than traditional fenders, too, which allo