Features Breathable Upper: engineered mesh upper that's breathable, lightweight and soft. ZoomX Foam Midsole: full-length ZoomX midsole made of Nike’s lightest and most responsive cushioning for a comfortable ride. Double Air Zoom: two Air Zoom units, one at the forefoot and one at the heel, boosting energy return. Durable Traction: durable Waffle outsole with high-abrasion rubber provides all the traction you need. Specs Weight: 351g/12.4oz Heel-to-Toe Drop: 10mm Cushion: Max Unisex Size Chart US Men's Us Women's 6.5 7 6 7.5 6.5 8 7 8.5 7.5 9 8 9.5 8.5 10 9 10.5 9.5 11 10 11.5 10.5 12 11 12.5 11.5 13 12 13.5 12.5 14 13 14.5