UNDER ARMOUR SEAMLESS RUN TANK - WOMEN'SUsing levels of mesh mapped to your body, you get ventilation where you need it, plus the comfort of fewer seams. It's pretty much the most comfortable thing you'll ever train in.FEATURESSoft knit fabric with engineered mesh ventilation, mapped to the places you need it mostNearly sew-free construction to eliminate chafing4-way stretch construction moves better in every directionMaterial wicks sweat & dries really fastAnti-odor technology prevents the growth of odor-causing microbesClassic racerback construction for mobilityTECH SPECSReflective details for low-light runs52% Nylon/48% Polyester