Oakley O-Shape Shirt 2.0 - BlackSmart zip neck polo purpose built for warm weather play. Made from lightweight stretch polyester for a comfortable fit that moves with you, it is treated with advanced Hydrolix moisture management technology to quickly wick away sweat and dry quickly even in the muggiest conditions. There is underarm ventilation to keep you cool and the special lattice like holes at the sides help to enhance airflow and reduce humidity and stickiness inside the shirt