Size 27/inner length approximately 17.2cm

Size 28/inner length approximately 17.8cm

Size 29/inner length approximately 18.5cm

Size 30/inner length approximately 19.2cm

Size 31/inner length approximately 19.8cm

Size 32/inner length approximately 20.4cm

Size 33/inner length approximately 21.1cm

Size 34/inner length approximately 21.8cm

Size 35/inner length about 22.5cm

Size 36/inner length approximately 23.1cm

Size 37/inner length approximately 23.6cm

Size 38/inner length approximately 24.1cm