2. S,M,L,XL 4 sizes available; S size best fit for head size 56~57cm/22~22.4in/7~7 1/8; M size best fit for head size 58~59cm/22.8~23.2in/7 1/4~7 3/8; L size best fit for head size 60~61cm/23.6~24in/7 1/2~7 5/8; XL size best fit for head size 62~63cm/24.4~24.8in/7 3/4~7 7/8;