Our comfort cap sizes are standard size (medium) and fit most people just fine. Small and large come into stock on an occasional basis however most of our wigs are the standard medium sizing.MEDIUM:Circumference - 54 cm (21.25")Front to Back - 35 cm (13.75")Ear to ear - 30 cm (11.8")Our Lace Top sizes are as follows: SMALL:Circumference - 52 cm (20.47")Front to Back - 34 cm (13.39")Ear to ear - 33 cm (13")MEDIUM:Circumference - 54 cm (21.25")Front to Back - 35 cm (13.75")Ear to ear - 34 cm (13.39")LARGE:Circumference - 56 cm (22")Front to Back - 36 cm (14.17")Ear to ear - 35 cm (13.78")