Inside gripper waistband keeps shirts tucked in Sizes 4-20: Adjustable elastic waistband for the best fit Moisture-wicking finish that keeps him dry Odor control finish helps keep fabric fresh UPF 50 keeps him protected from the sun Quality stitching is reinforced at all key stress points Two front and two back pockets along with a right back zippered pocket 81% polyester/19% elastomultiester. Machine wash.