Diagram illustrating how to measure head circumference with a non-stretchable tape, showing points A, B, C, and D on a head illustration.

CENTIMETRES

Size label chart with columns labeled A, B, C, and D, and a row indicating measurements with a range of 44 to 47 for size A, 22 for B, 7.5 for C, and 20.5 for D.

INCHES

Size label chart showing measurements for one size, with dimensions A through D listed in inches.