The Patagonia Men's Capilene 1 Silkweight Boxers are quick-drying 100% recycled polyester (with Gladiodor® odor control for the garment) is highly breathable and has exceptionally lightweight next-to-skin comfort. The new no-roll waistband is super durable and brushed for softness. Less fabric in the legs and back allow the boxers to glide easily under layers.