Clever Spinel Boxer 90% Nylon, 10% Spandex Machine wash warm on gentle cycle. Do not bleach. Tumble dry low setting or lay flat to dry. Do not iron. 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. Clever Moda Sizing: Small: 28-30" Medium: 32" Large: 34" X-Large: 36-38" (inches).