Perfect for trail running, tri training, marathons and everything in between, the Headsweats Crusher Cap is definitely versatile and easy to wear. With mesh on the top, back, and sides it offers maximum ventilation and comfort. The sweatband and woven shell allow for good moisture transfer and airflow to help keep a cool head. One size fits most, but there’s an adjustable rear buckle plus a ponytail opening. Certainly a great option for those who like their head gear to be simple yet sturdy. You just can’t crush the Crusher cap!