Tennis players who prefer to dominate the game from the baseline will find increased comfort in the GEL-RESOLUTION X shoe. Superior comfort and cushioning are provided with FF BLAST PLUS ECO foam in the bottom rear and FLYTEFOAM technology in the forefoot. For increased stability during lateral motions, the midsole's DYNAWALL technology now extends into the heel. When you're running and covering both sides of the baseline, this useful feature works well. DYNALACING technology has been carefully engineered to remain in place when more assistance is required. When you're making fast changes, this enables you to feel locked in. Finally, when making sudden cuts back and forth, the higher medial collar aids avoid ankle twisting.