Stay warm on the mountain without sacrificing mobility in the Marmot Men's Thermalclime Pro 12 Zip Long Sleeve Top. The Polartec Power Dry fabric is lightweight and moves moisture away from your skin rapidly to help you stay dry on intense hikes and leg burning runs. It's also extremely stretchy to allow total freedom of movement. An athletic fit keeps the fabric close to your skin so it wicks more efficiently, and the half zip front allows you to open it up and dump excess heat when things warm up in the afternoon. Plus, flatlock seams and a tag free collar reduce irritation to keep you comfortable throughout the day.