Features & Fastening: Velcro Style: Hollow Material: Patent leather Size:(1cm=0.39in.) Pls Choose The Size According To Your Foot insole Length EU 21= insole length 13.5cm EU 22= insole length 14cm EU 23= insole length 14.5cm EU 24= insole length 15cm EU 25= insole length 15.5cm EU 26= insole length 16.5cm EU 27 = insole length 17cm EU 28 = insole length 17.5cm EU 29 = insole length 18cm EU 30= insole length 18.5cm EU 31 = insole length 19.5cm EU 32 = insole length 20cm EU 33= insole length 20.5cm EU 34 = insole length 21.5cm EU 35 = insole length 22cm EU 36 = insole length 22.5cm Notice: Foot length + 0.5-1 cm = insole length