Why do swim trunks have a compression liner?：Without the lining, the outer trunks could easily cling to your skin. Compression lined swim trunks don’t move around like traditional loose netting or mesh, and they don’t trap things like sand as easily. Features: 2 in 1 Intimate elastic design. Trunks are super soft, waterproof & quick dry, with two side pockets and a lined compression pocket, drawstring design can automatically adjust the elasticity of the waistband. Material: The lining of men's swim trunks is made of 100% polyester, which is very breathable and comfortable for sports, and funny hawaiian and simple graffiti 3D patterns can bring a different feeling for your holiday. Occasion: Men's liner swim trunks are suitable for a variety of outdoor and indoor sports, surfing, sailing, swimming, also suitable for aerobic exercise, such as gym. Liner shorts have good sweat absorption function and is a ideal for sports and fitness. Best gift: These beach pants are stylish and durable. It is the best choice for a gift. Customer satisfaction is our highest priority. If you are not satisfied, please contact us to solve a problem, wish you have a good shopping experience.