Saucony Lady Grid Launch Running Shoes Leather Cushioning Technology: High Rebound Compound--High rebound compound provides responsive cushioning. Outsole: XT-900--XT-900 outsole material is an exclusive Saucony carbon rubber outsole material that offers better traction properties without sacrificing durability. Model Number: 15022-1 Recommended Fit: These shoes run True to Size. Classification: Racing/Specialty