Base layers have emerged as a must-have item when temperatures are on the low side. They trap in heat and regulate your body temperature to keep you warm and comfortable. A base layer is the layer closest to the skin and acts as a second skin to provide vital warmth throughout the day. The ergonomic design of the CG Armour Fitted Mock Base Layer keeps seems off of high abrasion areas for comfort and high durability. The CG (ColdGear technology) holds in body heat exceptionally well. The dual-layer fabric with an ultra-warm, brushed interior and smooth, fast-drying exterior all provide ultimate comfort and toasty warmth that we have come to expect from Under Armour. This well thought out top benefits from strategically placed stretch mesh back & underarm panels for added ventilation. The 4-Way stretch construction allows improved movement, while the material wicks sweat and dries extremely quickly. Anti-odour technology also prevents the growth of odour-causing microbes. The fabric is just the right combination of polyester and elastane for durability, comfort and stretch. Base layers simply don't come any better than this. Highly recommended from us here at Golfsupport.