Abstract: A baseball-type cap has a shell of general hemispherical shape within an open bottom. A visor is attached along a peripheral inner edge to the shell at the front of the shell. An arcuate inwardly and upwardly tapered opening is provided within the shell diametrically opposite the visor. A chord or other lace is looped through the holes within grommets attached to the shell at the corners of the shell at the rear opening proximate to the peripheral edge at the bottom of the shell and free ends of the lace are tied preferably in a bow, permitting infinite circumferential size adjustment of the shell to conform the shell to the head of a wearer.