FEATURES: Moisture absorption and sweat removal, comfortable, quick drying polyester mesh fabric structure. MATERIAL??100% polyester?? thin soft and light material, soft hand feel. SIZE??Head circumference 56-62cm adjustable webbing and buckle on the back.one size fits most . SUITABLE FOR: runners, golfers, tennis, baseball and any indoor or outdoor activities, unisex. 100% MONEY-BACK GUARANTEE: Any dissatisfaction can be refunded or replacement and try our best to provide you best shopping experience here.