Abstract: An adjustable head cap comprises a multi-gored portion having a lower brim, a visor, and adjustable means for adjusting the circumferential size of the cap. The adjustment means comprises a first strap member having a plurality of protruding studs (male members) and a second strap member having a plurality of spaced apart apertures (female members) wherein the female members are formed as a series of inclined hook-like members for improved interlocking engagement of the two strap members.