M-23Channel Islands M 23 Mid Length Surfboard The M23 comes from the storied M13 bloodlines, a favorite hybrid board Al Merrick made for himself and rode variants of for decades from fun Rincon to maxing Sunset. A true high performance hybrid that caters to the widest possible type and size of surfer and for the widest range of wave conditions. Not to be confused with the CI Mid, the M23 carries more foam, boasting a fuller rail and sleeker nose outline.