This practical classic-style hat is designed for comfort and sun protection. It has a mesh strip in the crown that lets air circulate to help keep your head cool, and a built-in sweatband to wick away moisture from your forehead. Providing a UV protection factor (UPF) rating of 50+ (mesh included), it has a brim that measures 2 3/4" wide on the front and back and 2" on the sides; dark fabric under the front brim reduces glare. A hidden pocket in the crown lets you carry a few pieces of ID, cash or other essentials, and sleeves in the band provide a place to perch your sunglasses. An adjustable sizing strap permits a comfortable fit. Water and stain resistant, the hat comes with an adjustable chinstrap and a liner in the crown that keeps your hat afloat if it gets blown overboard. Hand washable. The medium is for hat sizes 7 to 7 1/4 and head sizes 22" to 22 3/4". The large fits hat sizes 7 3/8 to 7 5/8 and head sizes 23 1/8" to 23 7/8".