Feiyue Classic Size Chart

US Men US Women EUR UK CM 
  4 36 2 23
  5 37 3 23.5
  6 38 4 24
7 39 5 25
6 8 40 6 25.5
7 9 41 7 26
8 10 42 8 27
9 11 43 9 27.5
10 12 44 10 28
11   45 10 28.5
12   46 11 29
13   47 12 29.5

Feiyue 1920 Size Chart

US Men US Women US Kids EURO/UNISEX (28 - 34) EUR UK MM CM 
  10 28 9.5 160 16
  11 29 10.5 170 17
  12 30 11.5 180 18
  13 31 12.5 190 19
  1 32 13.5 200 20
  2 33 1.5 210 21
  3 34 2 215 21.5
  4 4 35 35 2.5 220 22
  5     36 3 230 23
  6     37 4 235 23.5
7     38 5 240 24
8     39 6 250 25
7 9     40 7 255 25.5
8 10     41 8 260 26
9     42 8 270 27
10     43 9 275 27.5
11       44 10 280 28
12       45 11 285 28.5
13       46 12 290 29

If you normally wear a ½ size, buy the next full size. For example, 9 ½ , buy a 10.