Deerhunter Mens Performance Underwear Set is made from soft durable synthetic fibres which are strong and quick drying (59% Polyamide / 31% Polyester / 10% Elastane). This Deerhunter high performance underwear is super lightweight and designed without seams to be worn next to your skin to prevent any chaffing when active. There are ventilation zones in areas that may overheat. Machine washable at 40 degrees.