Puma evotraining actv tech t shirt with this puma evotraining actv tech t shirt there wont be anything holding you back on training days it features our performance enhancing actv thermo r technology that uses athletic tape at the back panel to help maintain the body temperature at an optimum performance level the seamless friction free powercell next to skin construction is designed to work with your bodys natural systems to help you enhance and maximise your performance during and after