The size is too small, buy the inner length according to the foot length of 1 or 1.5cm

26 inner length 16.2cm

27 inner length 16.8cm

28 inner length 17.4cm

29 inner length 18cm

30 inner length 18.5cm

31 inner length 19cm

32 inner length 19.5cm

33 inner length 20.1cm

34 inner length 20.7cm

35 inner length 21.3cm

36 inner length 21.9cm