The Swoosh gets activated and changes color when exposed to sun and UV light. See-through panels are layered over the sides as an accent stripe. More Benefits An elastic waistband and drawcord provides a snug fit. Product Details Standard fit for a relaxed, easy feel Side pockets Back pocket with snap closure Body: 80% cotton/20% polyester. Pocket bags: 100% cotton. Machine wash Imported Shown: Sapphire/Football Grey Style: DA0572-500