evo.com | Helly Hansen Long Underwear Tops > For those that need a warm winter base layer but tend to overheat, the Helly Hansen Lifa Merino Midweight 1/2 Zip Base Layer Top has you covered. A 100% merino wool exterior provides warmth while and moisture-wicking Lifa interior adds breathability against sweat. And when you feel the heat start to encroach, zip down the front to cool down as much or as little as you need. Light the snow on fire, comfortably. Flat Lock Seams for Maximum Comfort Snug High Performance Fit Printed Performance Stripe at Cuffs 225 g/m^2 57% Merino Wool Exterior / 43% LIFA(R) Polypropylene Interior LIFA(R) is the original Helly Hansen base layer, trusted by professionals around the world to provide warmth and insulation in cold weather. It is at its best when layered underneath another garment as it will push moisture away from skin and make sure you stay warm, dry and comfortable. Center Back 72cm | Helly Hansen Lifa Midweight 1/2 Zip Base Layer Top 2026 - Medium Green | Wool