95% Polyester + 5% Spandex Quick dry stretch fabric : keep you dry and flexible workout, lightweight and efficient breathable, 4-way stretch fabric panel. These swim trunks ensure snug fitting while helping improve mobility. Mesh lining and Zipper pockets : lining soft & comfortable; Two side zipper pockets for safer storage. Elastic waistband with drawstring: drawstring can be used freely adjustable tightness according your waist Suitable for any circumstance : swimming, beach surfing, running, ball sports, at home and etc.