21-25 yards long, 13，13.5，14, 14.5, 15.5

26-30 yards long, 16，16.5，17， 17，.718

31-35 yards long, 18.5，19, 19.5，20，21

Suggestions: for example, size 14 cm long feet straight up

Feet normal: feet long +0.5 cm, =14.5 cm long

Feet are fat: feet long +1 cm, =15 cm long