Air Cushion Design：Full-length Air unit gives a smooth, snappy feel.The Air unit delivers unrivaled,all-day comfort. UPPER：Fashion knitted mesh material and lightweight support maximizes the upper and let your foot always keeps dry and cool. INSOLE：The insole adopt honeycomb hole design, Keep your feet balanced and protect your ankle ,tongues and feet from hurt. Non-slip Sole：Increased rubber at the outsole helps deliver better traction and durability. Suitable for: running, jogging, off-road, cross training, gym, walking, cycling, camping, fitness, tennis, marathon, exercise, leisure, travel. Women 6 US =Men 5 US =Feet length: 9.055 Inches =230mm=36 EU Women 6.5 US =Men 5.5 US =Feet length:9.252 Inches =235mm=37 EU Women 7 US =Men 6 US =Feet length:9.449 Inches =240mm=38 EU Women 8 US =Men 6.5 US =Feet length: 9.646 Inches =245mm=39 EU Women 9 US =Men 7 US =Feet length: 9.842 Inches =250mm=40 EU Women 10 US =Men 8 US =Feet length: 10.039 Inches =255mm=41 EU Women 11 US =Men 8.5 US =Feet length: 10.236 Inches =260mm=42 EU