The Hot Chillys Men's Micro-Elite XT Zip T-Neck is a mountain weight, single face stretch base layer that can also be used as a mid-layer. This thermal pullover features a durable smooth outer face for easy layering, a soft, brushed fleece backing and a zip through collar with interior wind flap for ultimate warmth. The Hot Chillys Men's Micro-Elite XT Zip T-Neck is the perfect choice for when it's really cold and layering is a must!