To find the right size for you, we suggest wrapping a measuring tape around your head, keeping it above your ears, and allowing it to meet in the middle of your forehead. 

If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. 

S/M: 20"-22" 

L/XL: 22"-24" 
2XL/3XL: 24"-26"