iMaySon(TM) Men's Briefs Swimsuits Sports Swimming Underwear Trunks Swimwear With Pocket polyester Material Fabric:82% Polyester/Nylon,18% Spandex. Material Performance:Soft,High-elasticity,Good breathable and Moderate thickness. Trunks Dimensions(Waist):Medium 68-76cm / 26.8"-29.9",Large 76-84cm / 29.9"-33.1",X-Large 84-92cm / 33.1"-36.2",XX-Large 92-10cm / 36.2"-39.4" Due to the material, please wash with cold water.Warm water will damage the trunks. We usually suggest our customers order one size up than normally wear due to Asian size.If you still have any questions,dont hesitate to contact us.