When exposed to the extreme cold, grab the Under Armour ColdGear Infrared Men's Hood for protection. It features ColdGear Infrared technology which uses a thermo-conductive inner coating to absorb and retain your own body heat to keep you warmer, longer without adding weight or bulk. Form-fitting balaclava provides full facial coverage but can be worn with the chin dropped or just as a neck gaiter for more ventilation. Moisture wicking technology keeps you dry and Anti-Odor technology prevents the growth of odor-causing microbes. One size fits most ninjas.