Built with a Nike Air unit and a thick stack of Cushlon 3.0 foam, the Winflo 12 is the perfect combination of enhanced responsiveness and consistent cushioning. Breathable mesh up top and an accommodating fit help you feel locked in and ready to push for that extra mile. Breathable upper: The upper is made with open-hole mesh for optimal breathability. Product Details: Weight: approx. 261g (women's UK 5.5). Heel-to-toe drop: 9mm What's New?: Increased Cushlon 3.0 foam stack height compared to the Winflo 11. Accommodating fit. Open-hole mesh upper