LIFA is the original Helly Hansen base layer made of 100% LIFA fibers, providing warmth and insulation in cold weather. LIFA naturally pulls moisture away from skin and to the outer layer of the garment keeping you warm, dry and comfortable. FEATURES: 2-layer construction, 3/4 length, 100% Merino Wool exterior, 225g LIFA Merino fabric, Non-itch, Flat lock seams GOOD FOR: Camping & Hiking, Climbing & Mountaineering, Trekking, Resort, On Piste, Alpine, Winter, Skiing FIT: Fitted - Slim fit to body. Fitted technical garments may be worn over baselayers and light midlayers. Pants are slimmer through the thigh and knee and won't go much below the ankle when standing up straight.