Sizes are based on European (Italian) dimensions, below is a conversion chart for your convenience:
 

EU IT 35 35½ 36 36½ 37 37½ 38 38½ 39 39½ 40 40½ 41
UK 2 3 4 5 6 7 8
US 5 6 7 8 9 9 ½ 10 10½ 11
JP 22 22½ 23 23½ 24 24½ 25 25 ½ 26 26 ½ 27 27 ½ 28
AU 4 5 6 7 8 9
KP 220 225 230 235 240 245 250 255 260 265 270 275 280
CN 35 35½ 36 37 37½ 38 39 39½ 40 41 41½ 42 43
CN 225 228 230 233 235 238 240 243 245 248 250 253 255