The 2-layer cap with Polycolon® lining is designed for optimal warmth and comfort. It features a bi-elastic beanie construction, meaning it stretches in both directions for a snug fit. The Polycolon® lining is a moisture-wicking, quick-drying fabric that helps maintain a dry feel, even during intense activity. This combination of materials ensures that the cap not only provides warmth but also keeps you dry, making it ideal for outdoor sports or cold-weather activities where you need both insulation and breathability. Made by Maloja, Official Outfitter of the Birkie.