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botton width foot thickness + 1cm(脚宽脚厚＋1cm) size 25 inner length is about 15.8cm(25码内长约15.8cm) size 26 inner length is about 16.4cm(26码内长约16.4cm) size 27 inner length about 17.1cm(27码内长约17.1cm) size 28 inner length about 17.8cm(28码内长约17.8cm) size 29 inner length is about 18.4cm(29码内长约18.4cm) size 30 inner length is about 19.1cm(30码内长约19.1cm) size 31 inner length is about 19.6cm(31码内长约19.6cm) size 32 inner length about 20cm(32码内长约20cm) size 33 inner length is about 20.5cm(33码内长约20.5cm) size 34 inner length is about 21.2cm(34码内长约21.2cm) the inner length of size 35 is about 21.8cm(35码内长约21.8cm)