The GEL-RESOLUTION X tennis shoe delivers superior comfort for those who like to control the game from the baseline. 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.