Engineered with Ralph Lauren Polo's cutting-edge ThermoVent technology, this lightweight T-shirt will keep you cool and dry throughout your workout. Flat seams minimize friction, providing unparalleled comfort. ThermoVent is an innovative fabric technology that transfers sweat away from the body to the fabric's surface for high-speed evaporation.Size medium has a 27½" body length. Round neckline. Reflective loop at the back of the neck. Short sleeves.100% polyester. Machine washable.