Abstract: A custom-fit cap having a visor portion and a substantially hemispherical crown portion attached to the visor portion and at least a crown portion opposite the visor and covering the back of the head being formed of the material that stretches at least circumferentially about the crown portion for accommodating various head sizes. A band that is stretchable circumferentially and is attached to the inside of the hemispherical crown portion adjacent the base thereof forms a sweat band to engage the head of the user while allowing the cap to stretch circumferentially with at least that portion of the crown portion covering the back of the head opposite the visor, so as to enable the cap to self-adjust automatically to fit a plurality of head sizes.