100% polyester imported elastic closure machine wash Size: S/M/L/XL/2XL/3XL(As shown High Quality Material100% high quality polyester, quick dry, breathable, lightweight, comfortable, skin-friendly fabric. Bath Change: The swim shorts will change color in warm water, not because of the humidity, but because of the temperature of the water. Take it to the beach, pool, party and even the gym. Make your friends envious. (Our color changing shorts are Asian size, please refer to the size chart when purchasing, it is recommended to buy shorts one size larger) PERFECT DESIGN: These temperature sensitive color changing perfect wash twill pants have a mesh lining that covers the elastic waistband and drawstring for a better fit, and two side pockets that expand to hold your phone or small accessories .