Abstract: A surf craft such as a surfboard or windsurfer comprising a planing plank (15) forming the complete lower surface (14) of the craft and a stiffening spine (11) upstanding from and extending substantially the length of the planing plank (15). The spine (11) being integral with the planing plank (15) to form a structural unit with the planing plank projecting laterally from either side of the central spine. These lateral projections (31) of the planing plank (15) being independently resiliently deflectable in use relative to the central stiffening spine (11). Filler pads (35) on either side of the spine rest on and secured to the planing plank (15) to form with the spine a platform for a rider of the craft to stand and move about on when the craft is in use. The filler pads (35) being resiliently flexible with the planing plank.