Ski underwear with both undershirt and Long John in moisture-transporting quality that keeps you warm. The trousers have elastic at the waist. The quality is 100% polyester. True North Skiunderwear: True North X-cool layer 1 underwear are made of 100% X-Cool. This a light, flexible and quick drying synthetic technical fabric, designed especially for action and adventure sports. The fabric is very soft and comfortable which makes it perfect for layers close to the body. You can be sure that it will keep you warm and dry in the most demanding conditions.