adidas Performance Men's Questar Elite Running Shoe 100% Synthetic/Mesh/Textile Imported Rubber sole Weight: 11.1 ounces (size 9); 11 mm drop; 33.5/22.5 mm stack heights boost's energy-returning properties keep every step charged with an endless supply of light, fast energy Lightweight, breathable two-way stretch upper Extended TORSION SYSTEM for energy return in the forefoot and natural integrity in the midfoot Heel and midfoot cage for exceptional fit