Under Armour Women's ArmourVent HeatGear Short Sleeve V-Neck Shirt 91% Nylon/9% Elastine Machine Wash Cold Iso-Chill construction helps dissipate heat from the body creating a cooling effect Anti-microbial technology keeps your gear smelling fresher, longer ArmourVent mesh delivers true breathability in a light, stretchy, durable, fast-drying fabric Lightweight, 4-way stretch construction improves mobility and maintains shape Signature Moisture Transport System wicks sweat to keep you dry and light