The Men's Apex Leggings are made from an amazingly soft, breathable 260gm pure merino jersey that keeps you really warm during cool to cold weather sports. Built to move, with a crotch gusset and flatlock seams, The Apex leggings are a great baselayer for active winter sports, or hiking or running on cold mornings in shoulder seasons. You can bring one pair on a multi-day backcountry excursion, because the natural odor prevention of merino keeps them fresh for multiple wearings.