Compressport Women's Trail Running Ultra Tank Top Its ergonomic cut with no seams, gives unique support and postural 3D that help keep a correct and straight position while diminishing tension during intense effort Its notched armholes guarantee freedom of movement Targeted positioning of ventilated mesh on the shoulders, front and back, helps evacuate heat and sweat so you stay fresh and dry Its unique weave enhances air circulation, thus balancing inside and outside temperatures of the tank, so that body temperature is stable with no sudden surges or drops Unpleasant odours, irritations and bacteria are kept aloof