When you are buying, if you do not know about the size, you can refer to the following information to choose.
5.5 women/4.5 men=EU36----inner length 23 cm
6.5 women/5.5 men=EU37----inner length 23.5 cm
7.5 women/6 men=EU38----inner length 24 cm
8.5 women/6.5 men=EU39----inner length 24.5 cm
9 women/7 men=EU40----inner length 25 cm
10 women/8 men=EU41----inner length 25.5 cm
10.5 women/8.5 men=EU42----inner length 26 cm
11 women/9 men=EU43----inner length 26.5 cm
12 women/10 men=EU44----inner length 27 cm
13 women/10.5 men=EU45----inner length 27.5 cm