US Men 5 = EUR37 = 23CM, US Men 5.5 = EUR37.5 = 23.5CM, US Men 6 = EUR38 = 24CM, US Men 6.5 = EUR39 = 24.5CM, US Men 7 = EUR39.5 = 25CM, US Men 7.5 = EUR 40 = 25.5CM, US Men 8 = EUR40.5 = 26CM, US Men 8.5 = EUR41 = 26.5CM, US Men 9 = EUR42 = 27CM, US Men 9.5 = EUR43 = 27.5CM, US Men 10 = EUR44 = 28CM, US Men 10.5 = EUR44.5 = 28.5CM, US Men 11 = EUR45 = 29CM, US Men 11.5 = EUR45.5 = 29.5CM, US Men 12 = EUR46 = 30CM, US Men 12.5 = EUR46.5 = 30.5CM