HeatGear is our original performance baselayerthe 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 athlete can go without it. Our original HeatGear fabric is super-light, breathable & dries fast Material wicks sweat & dries really fast 4-way stretch material moves better in every direction Compare prices from: Under Armour in Baby & Children's Clothing