The Carhartt 100765 low-profile cap is made of 97% cotton/3% spandex with 100% polyester tricot crown lining and 100% polyester sherpa earflap lining for warmth. Earflaps can be flipped down for cold-weather protection. When you start to grind hard on the job, its Coolmax® sweatband wicks away moisture for comfort. WorkFlex® fitted sizing: M/L or L/XL. Carhartt label sewn on front.