The best performance running singlet for training or racing. The 4.4 ounce performance micro-fiber fabric will keep you cool in the heat and warm when there's a chill. Superior wicking performance, and anti-microbial, anti-mildew, and anti-stain features. Feel free to customize this item...change the colors, add a photo or text...you have the power to make it a one of a kind original! Proceeds of this sale will benefit The Leukemia & Lymphoma Society.