The LIFA Active is a high-performance base layer designed to provide excellent moisture management and lightweight insulation for all your outdoor activities. The LIFA Active Crew Base Layer is equipped with an advanced 2-layer construction that places 100% LIFA fiber next to your skin, while the outer layer consists of wicking technical fibers. This combination delivers unbeatable moisture management, lightweight warmth, and all-day comfort, making it an ideal choice for your outdoor adventures. Mens LIFA Active Crew Base Layer Top