This 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: Medium/Large or Large/Xlarge. Carhartt label sewn on front.