Helly's 2-layer system enables maximum moisture management while keeping you warm all season long LIFA® ACTIVE is a performance base layer, delivering superior moisture management and lightweight insulation for all year activities. LIFA® ACTIVE is an advanced two layer construction with 100% LIFA® fiber next to skin and wicking technical fibers outside. All in all, an unbeatable combination for moisture management, lightweight warmth and all day comfort.Fiber Content: 65% Polyester, 35% Polypropylene FEATURES 2-layer constructionExcellent moisture management propertiesLIFA® fibers interiorWicking polyester exteriorFlat lock seams