shoe size:
  26 yards /15.7cm
  27 yards /16.5cm
  28 yards /17.2cm
 29 yards  / 18cm
   30 yards  /18.5 cm
 31 yards  / 19cm
  32 yards  /19.5cm
33 yards  /20cm
34 yards  /21cm
  35 yards /21.5cm
  36 yards /22.9cm