Lightweight support and breathable that make your foot always keeps dry and cool.The rubber outsole offers impact cushioning anti-twist abrasion-resistant and anti-slip performance and the soft insole fits well and protect your ankle tongues and feet from hurt.Suitable for daily school gym class running playing walking indoor sports outdoor travel exercise workout vacation. Site Chart:(Inch) US 1.5= INNER LENGTH/CM 20.5 = FEET LENGTH/CM 20 US 2.5= INNER LENGTH/CM 21.5 = FEET LENGTH/CM 21 US 3= INNER LENGTH/CM 22 = FEET LENGTH/CM 21.5 US 3.5= INNER LENGTH/CM 22.5 = FEET LENGTH/CM 22 US 4.5= INNER LENGTH/CM 23.5 = FEET LENGTH/CM 23 US 5= INNER LENGTH/CM 24 = FEET LENGTH/CM 23.5 US 5.5= INNER LENGTH/CM 24.5 = FEET LENGTH/CM 24 US 6.5= INNER LENGTH/CM 25.5 = FEET LENGTH/CM 25 US 7= INNER LENGTH/CM 26 = FEET LENGTH/CM 26.5 US 8.5= INNER LENGTH/CM 27.5 = FEET LENGTH/CM 27