Non-slip: slip resistant rubber outsole. Lightweight: less than 1.9 pound each pairs. High increasing: 2 inch platform sole. Supportive: cushioning polyurethane midsole. Size chart (foot length): size 5 = 8.7 inch.size 6 = 9 inch.size 6.5 = 9.3 inch.size 7 = 9.5 inch.size 8 = 9.8 inch.size 9 = 10 inch.size 9.5 = 10.3 inch.size 10 = 10.6 inch. RUIDENG womens sneakers walking designed for someone who want a canvas wear, the upper made by canvas material for providing more comfortable feeling for your feet, the sole made by cushioning 2 inch polyurethane midsole with non-slip rubber outsole, makes you looks more higher, stable on walking.