REI Heavyweight MTS Long-Sleeve Crew - Tall - Men's

Our heavyweight MTS® underwear is an excellent first layer for mountaineering and other high-energy, cold-weather activities. Quick-drying and moisture-wicking, ultra-soft MTS® microfleece draws perspiration away from skin to keep you warm, dry and comfortable. Droptail hem stays tucked in and offers extra coverage in back. All seams are flatlock stitched to avoid abrasion and bulk. With four-way stretch and a close-fitting cut, top is thermally efficient and won't inhibit movement. Fabric provides UPF 50+ sun protection, shielding skin from harmful ultraviolet rays.