Features: Polartec Alpha Direct Insulation increases breathable performance in this super lightweight mid-layer. Alpha technology eliminates the need for a backing fabric, which allows the fabric to be in direct contact with your skin. Lofted fibers keep you extremely warm, while allowing sweat and heat to expell from your body. Exterior shell fabric is engineered to allow this jacket to breathe even better and move moisture from the insualtion to the exterior to dry; keeping you dryer than ever before. Relaxed Fit Trail Jacket is loose and comfortable, and also provides plenty of room for layering underneath. Fabric Content: SHELL: 85% Nylon, 15% Spandex; LINING: 100% Polyester.