NIKE Court Tennis Polo Shirt/T-Shirt 100% Polyester A modern style tennis polo shirt with a collarless design crafted from premium cotton and a breathable polyester top-layer for ventilation and ultimate comfort on the court 3 button placket with a collarless style Eyelets on the underarms for ventilation The drop tail hem provides enhanced coverage Face of body fabric : 100% polyester. Back of body fabric : 100% cotton.