This T-shirt features an underarm gusset for wide arm lift range and a backwards shifted shoulder seam for extra comfort while wearing a backpack, making it immensely versatile. So, whether you are hitting your PRs at the gym or out running the trails, this top is for you.·       AEROREADY technology·       Reflective detailing ·       Underarm gusset for wider arm lift range ·       Regular fit ·       Slightly longer back construction ·       Backwards shifted shoulder seam for extra comfort while wearing backpack ·       Fabric: 100% Recycled polyester