Hot Chillys Men's Micro-Elite Chamois Zone Quarter Zip Long Sleeve Base Layer Shirt - Your go-to for a classic men's midweight base layer, Micro-Elite Chamois is the descendant of the first technical under layer created in 1984. Hot Chillys MEC Zone Zip-T is a highly technical, high-performing piece of base layer that'll keep you warm for years to come. Comfort active stretch seam construction Seams set away from shoulder for added support Zip through collar with interior wind flap for ultimate warmth Moisture transfer fibers to wick away moisture from your skin Thumbholes Four way stretch for unlimited movement Bio-Silver Odor Blocking properties UPF 30 protection Midweight Style: HC9931