The Kari Traa Sjølvsagt Set is a functional long sleeve top and bottom base layer combo with an upbeat, trendy look. The garments are made from polyester fabric that fits tightly and wicks away moisture fast. Flatlock seams and a one panel underarm construction prevent chafing. A snug fit with 4-way stretch allows for total freedom of movement. This base layer keeps you feeling fresh and comfortable during high-energy activities in the cold.