The original technical Helly Hansen long sleeve base layer. Lifa: 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: lightweight insulation, 100% lifa, flatlock seams for max comfort, natural stretch fabric Good for: ocean & offshore sailing, coastal sailing, inshore sailing, dinghy sailing, camping & hiking, climbing & mountaineering, trekking, off piste, side Country, freeride, resort, on piste, alpine, backcountry, ski touring, mountaineering, Fit: Regular - Neither Slim nor Oversized. Regular-fitting garments may be worn over thicker midlayers. Pants will have a standard inseam with a cut that's straight through the leg..Care instructions: Machine Wash Machine wash in luke warm water - 40°C, Do not bleach, Do not tumble dry, Do not iron, Do not dry clean