ColdGear Infrared technology with thermo conductive coating absorbs and retains body heat Lightweight two tone closed hole mesh fabric for incredible breathability Moisture wicking material dries quickly Adjustable hood for added versatility Built in thumb loops keep sleeves in place and trap warmth Raglan sleeves for enhanced mobility Loose fit for complete comfort ColdGear Infrared technology holds in body heat, without adding weight or bulk. It's a special, soft print on the inside and it keeps you warmer, longer, so you can work out in the bitter cold.