Polarmax® Men’s Core 4.0 LS Crew is high-performance heavyweight ls crew ideal for intense colder weather activities. Polarmax®Acclimate® Dry moisture-wicking/quick drying & Ag47™antimicrobial protection will keep you comfortable, dry and odor free by pulling moisture away from the body to the outer surface of the fabric to achieve rapid evaporation while killing odor-producing bacteria! Clean Seam® flat seams help reduce irritation, while 4-way stretch allows for unrestricted range of motion. Simply our warmest base layer, tech face front and soft fleece back, you'll love the fit and appreciate the warmth in the coldest conditions! Guaranteed to provide longer performance, regardless of the conditions, make Polarmax your Layers for Life™! Athletic Fit-No Bulk. Made in the USA!