Unico Swim Brief Playa Duna Men's Swimwear. Incomparable quality and comfort without compromising style. The unstructured underwear patterns aid movement and become a second skin. Offers excellent support, ideal for both competitive or leisurely sport. High durability and retention of shape. Sizing. Small: 28-30" Medium: 32" Large: 34" X-Large: 36-38" (inches).