Cold weather doesn't stand a chance against this defense. Insulation at the chest pairs with Nike Therma-FIT technology to help keep you warm. Fit & Design: Reflective details Responsible Cotton means: responsible cotton sourcing scheme cotton, recycled cotton, or organic cotton Thumbholes let you extend your coverage and help hold the sleeves in place while you move Technology: Nike Therma-FIT technology helps manage your bodya (TM)s natural heat to help keep you warm in cold-weather conditions.. Men's Shirts & Tops from the Nike brand.