adidas Speed Trainer 2 SL Mens Running Shoe Synthetic Lightweight synthetic upper provides maximum comfort and dirt protection. OrthoLite sockliner provides cushioning and odor resistance. Articulated full-length ADIPRENE+ midsole for long-term lightweight and responsive cushioning. Decoupled outsole allows lateral movement of the foot and optimal quickness. Multi-surface traction outsole for optimal grip on grass, turf, or indoor surfaces.