Elastic,Polyester,Mesh Polyester lining Elastic closure Superior Material:quality polyester, quick-drying, breathable, lightweight, comfortable and skin-friendly fabric, can direct contact to skin Color-Changing Swim Trunks:Swim Trunk Shorts can change color in warm water, not because of the moisture, but because of the temperature of the water. Take it to the beach, pool, party or even to the gym. Be the envy among your friends Perfect Design: Board shorts with mesh lining covered elastic waist band with drawstring, it could fit you better, two side pockets can be expanded to hold your phone or small accessories Perfect for summer beach,surfing, running,walking,pool party, casual homewear and vacation.Please read the size chart for reference on the left before ORDERING(the bigger One is better choice if between two size)