D.O.T. Carbon Fiber Skull Cap w/Visor

The Following Sizes Are An Approximation And  

XS = 19 1/8” – 20”  

S = 20 1/8” – 21”  

M = 21 1/8” – 22”  

L = 22 1/8” – 23”  

XL = 23 1/8” – 24”  

2XL = 24 1/8” – 25”