Keep cool as you move with this men's core vest from on running. In a black colourway, this slim fit vest is cut from smooth, breathable polyester for cool comfort. It features armholes and a crew neckline and is finished up with the on running logo to the chest. Machine washable | our model is 6'1" with a 39" chest and wears a size medium. Material: 100% polyester. Colour: black