A long traverse with frequent pace changes asks a mid-layer to manage sweat, and the Fleece Light 1/2-Zip Jacket from Ortovox is a half-zip fleece mid-layer with merino wool against the skin that absorbs moisture and neutralizes odors. The highly breathable fabric regulates climate through strenuous effort. It also wears confidently as an outer layer. What Our Gearhead(R) Experts Are Saying:"After a season of steep uphill days, I opened the half-length zipper as soon as the effort climbed, and the heat vented right out. The stretch moved with every step, and the jacket slid on and off easily at the top."