Hit the hills in the Helly Hansen Odin High Neck ($100). Specially designed for extreme use on high alpine and arctic expeditions, this base layer is constructed of Lifa fibres and merino wool to deliver exceptional warmth and moisture control. The Odin features extra long cut with drop tail to protect midriff during climbs, flat lock stitching and 5 different Lifa fabrics and 10 different fiber sructures to work in sync with different parts of the body.