A:

For headgear, use a tape measure and measure around the head atthe temples and use these measurements as a guide:
Small = 21 5/8" and below;
Medium = 21 5/8" to 22 3/8";
Large = 22 3/8" to 23 1/2";
X-tra Large = 23 1/2" and above.

A:

The shinguard sizing is based from the measurement around the calf, at the largest place. If the measurement is under 14 inches, the manufacturers recommend size s/m or reg. If the measurement is 14 to 15 inches, the manufacturers recommend size l/xl.

If the measurement is over 15 inches, the manufacturers recommend size 2xl. To measure for a hat/headgear, use a tape measure and measure around the head. If the measurement is up to 21 5/8, choose Small. If the measurement is from 21 5/8 and up to 22 3/8 inches, choose Medium. If the measurement is from 22 3/8 inches to 23 1/2 inches, choose Large. If the measurement is over 23 1/2 inches, choose XL.

A:

The sizing depends on your height and calf size. It is stated that size regular as 13-14" and lg as 15-16".