Eco Dynacool fabric Mesh material on the back Reflective details for extra visibility Green-R: Sustainable Production Make every run more comfortable with the Core Hard Running T-shirt. Made with thin Eco Dynacool fabric, it provides good ventilation and stays nice and cool. Smart mesh inserts improve air circulation, keeping your body at an optimal temperature. Reflective details provide extra visibility in the dark or at dusk, so you can run with confidence at any time of day. This running shirt features the Green-R label, which signifies sustainable production, so you're not only choosing comfort but also contributing to a greener future. The Core running top is the perfect companion for cool, carefree runs, with sustainability and safety in mind.