All our items are:BRAND NEWAUTHENTICIn Original box / PackageSHIPPING: Free shipping with economy post - delivery takes 2-3 weeks. FedEx - delivery takes 1 week. The latest version provides excellent flexibility during every run thanks to the advanced technology of two Zoom Air gas cushions placed in the front of the shoe and in the heel, on an even softer and more dynamic ReactX foam. ReactX foam provides 13% more energy return and has a 43% lower carbon footprint than regular React foam. Nike men's shoe size chartEU36.036.537.538.038.539.040.040.541.042.042.543.044.044.545.045.546.047.047.548.048.549.049.550.050.551.051.552.052.553.053.554.054.5CM23.023.523.524.024.024.525.025.526.026.527.027.528.028.529.029.530.030.531.031.532.032.533.033.534.034.535.035.536.036.537.037.538.0UK3.54.04.55.05.56.06.06.57.07.58.08.59.09.510.010.511.011.512.012.513.013.514.014.515.015.516.016.517.017.518.018.519.0US4.04.55.05.56.06.57.07.58.08.59.09.510.010.511.011.512.012.513.013.514.014.515.015.516.016.517.017.518.018.519.019.520.0