Nike Women's Sporty V-Neck Tank Teal/Blue(Medium) 100% Polyester Ultralight, ultra-soft Dri-FIT fabric wicks sweat away to the fabric's surface, helping you stay cool, dry and comfortable. Fabric composition: 100% Polyester Bonded shoulder seams move smoothly against your skin, minimizing chafing during repetitive running movements while adding durability Mesh panels on side for breathability Reflective elements for visibility in low light.