adidas Performance Women's Ultra Boost Street Running Shoe 100% Fabric, Synthetic Imported Rubber sole Running shoe in Primeknit engineered mixed knits with three-stripes lateral lace cage and contrast laces 8 mm heel-to-toe differential Boost energy-returning technology TORSION SYSTEM for midfoot integrity Ergonomic heel structure STRETCHWEB adaptive outsole with Continental wet/dry rubber Weight: 9.8 ounces (size 7)