Abstract: A cover for use on a boat or small craft, comprising a cover which is a tension member, hold-down straps which are tension members, tubular framing. The tubular framing comprises a pair of support members for the cover mounted forwardly and rearwardly of the boat, a hinged connection disposed medially of the support members wherefor a center-spanning cover is created which is secured to the framing and the hinged connection and tensioned supports enables the cover to be adjusted for desired peak drainage and width adjustment.