Whether packing snowballs or waiting for the school bus on frosty winter mornings, all they’ll feel is warm in this baselayer top made from a soft, wicking fabric with a heat-trapping thermal reflective lining. This product incorporates an antimicrobial treatment intended to protect the product from bacterial growth. The active biocidal substance is: pyrithione zinc. Modern Classic Fit Omni-Heat™ thermal reflective Omni-Wick™ Center Back Length: 18.5" Uses: Hiking, Ski / Snowsports Hiking type: Day hiking Shell: Omni-Heat Reflective™ 100% polyester interlock