Nike Pro Hypercool Frequency Womens Training Tank Top 100% Polyester DRI-FIT/STAYCOOL fabric wicks away sweat to help keep you cool, dry and comfortable Racerback design for unrestricted mobility Engineered mesh on the back for ventilation where you need it most Flat seams reduce irritation caused by chafing and move smoothly against your skin The shirttail hem provides greater coverage during high-reach exercises