Wool long johns are a perfect layer 1 underpants. The quality is very soft and lovely to wear. Produced in 50% Merino wool/45% Bamboo viscose/5% spandex. Wool is a super material as it has the property of being antibacterial, transports moisture well, cools when you are hot, keeps you warm when you are cold, keeps the body dry and is very comfortable to wear in this Wool/Bamboo blend. Wide comfortable elastic at the waist for the best fit. Weight in size M 183g.