The Helly Hansen H1 Pro Lifa Seamless 1/2 Zip Top is the ultimate baselayer. By combining the powers of merino wool and Helly Hansen's signature LIFA® material the Helly Hansen H1 Pro Lifa Seamless 1/2 Zip Top provides top shelf utility through a wide scope of activities. Body-mapped thermally insulated panels and a 1/2 zip design make this an easy choice to reach for, while the seamless design provides elite levels of comfort. It's breathable enough for absurdly long skin tracks, and warm enough for absurdly huge snowstorms.