Heat Gear is our original performance baselayer-the one you put on first and take off last. So we made it extra comfortable by wicking sweat and stretching so you can move no matter what. Super-light Heat Gear fabric delivers superior coverage without weighing you down. Material wicks sweat & dries really fast. 4-way stretch material moves better in every direction. Anti-odor technology prevents the growth of odor-causing microbes. Ergonomic flatlock seams deliver a comfortable, chafe-free fit.