Siding panel with interlock

A siding panel is provided for attachment to a structure and connection to a similar overlapping siding panel in interlocking relationship. The panel includes a strip for attachment, such as by nailing, to a supporting structure, a receiver formed by outer and inner bends, at least one stretch extending away from the strip and presenting a gap between the outer bend and the stretch, a base and a projection, all extending the length of the panel. The projection is configured to interfit with a receiver of an adjacent panel, with the projection including a flange, a return bend and a cantilever leg. The projection snap fits into the receiver, with the cantilever leg deflecting as the return bend flexes to permit passage of the projection into the receiver.