This hybrid midlayer is designed for high-performance outdoor activities such as ski touring, cross-country skiing, trail running, and other strenuous pursuits. The upper section offers excellent thermal insulation to keep you warm in cold conditions, while the skin stretch material in the lower section and sleeves provides breathability and freedom of movement. Certified as a bluesign® PRODUCT, this midlayer ensures responsible resource use and environmentally safe production processes, utilizing both synthetic and natural fibers. Ideal for athletes who demand both warmth and performance during intense activities, this piece is a sustainable choice for active outdoor adventures. Made by Maloja, official outfitter of the Birkie.