The Puma XX Nitro Nova Shine is a running shoe specifically designed for women. The XX Nitro is named after the female chromosones as the shoes are designed to fit the female anatomy and pattern of motion. The upper is engineered to provide a perfect fit for women's feet with special focus on the heel, the instep and the ankle. In addition the luxurious Nitro-foam in the midsole is tuned to provide comfort while its designed with minimal weight and is very durable. In addition it comes with Pumas Run Guide-technology around the heel to provide stability for your feet. Puma XX Nitro Nova Shine Specifications: - Specifically designed for women - Nitro-foam in the midsole - Run Guide technology provides stability