Size 16 with an inner length of 12.5cm is suitable for 11.5-12Size 17 with an inner length of 13cm is suitable for 12-12.5Size 18 with an inner length of 13.5cm is suitable for 12.5-13Size 19 with an inner length of 14cm is suitable for 13-13.5Size 20 with an inner length of 14.5cm is suitable for 13.5-14Size 23 with an inner length of 15cm is suitable for 14-14.5Size 24 with an inner length of 15.5cm is suitable for 14.5-15Size 25 with an inner length of 16cm is suitable for 15-15.5Size 26 with an inner length of 16.5cm is suitable for 15.5-16
