Features: Size is optional (chest measurement): M(CN),S(EU),S(US)=Chest 98cm, 35.58in / L(CN),M(EU),M(US)=Chest 102cm, 40.16in / XL(CN),L(EU),L(US)=Chest 106cm, 41.73in / XXL(CN),XL(EU),XL(US)=Chest 110cm, 43.31in Made of 100% polyester fabric, breathable, quick-drying, wicking, feels amazing against your skin. Collar reinforcement for durable wearing. Body fabric treated with three-needle-five-thread stitch. Minimal flat-seam construction won't chafe or restrict movement. Reflective stripe on shoulders and a reflective logo on the chest for safer night running. Its streamlined sleeve design includes a range of motion-enhancing underarm gusset.