Clever Moda Zircon Classic Brief, Men's Underwear. 80% Nylon, 20% Spandex Machine wash in soft cycle, using mild detergent. Do not use chlorine bleach. Do not iron. Dry in the shade. 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).