Size

Circumference

Width

Thickness

Large

8 3/8 " (fits most adults)

0.5" Wide

0.08"

Medium

7 3/8" (fits most children and teenagers +small-framed adults)

0.5" Wide

0.08"

Child

5 7/8" (for children 4-8 years old)

0.4" Wide

0.08"