"NikeBig Kids' (Boys') Training Shorts SHOW YOUR TRUE COLORS.Step out and watch the magic unfold in the Nike Instacool Shorts. The Swoosh swiftly changes color in the sun—wow! They’re also super breathable. With shorts this fun, playtime outside may never stop. This product is made with at least 75% recycled polyester fabric. Sweat WickingDri-FIT technology moves sweat from your skin for quicker evaporation—helping you stay dry, comfortable and focused. All About BreathabilityMesh fabric is super breathable and lightweight so you can stay cool. Body Heat-ActivatedThe Swoosh gets activated and changes color when your body heats up. More Details Standard fit for a relaxed, easy feel Elastic waistband with drawcord Side pockets Hanger loop Body: 100% recycled polyester. Pocket bags: 100% polyester. Machine wash Imported 100% POLYESTER"