Military style boonie hat,Unisex Two snap buttons help changing to another style hat,Designed to protect the head from sun and sand Size Measurements: S/M-22-1/2" 22-5/8"(56cm-58cm), L/XL- 23"-23-1/2"(58.5cm-60cm) Adjustable chin strap,With wide brim for ultimate protection from UV Type "The Hat Depot" in the search box to find all of our great headwear on Amazon!