I.g.s (impact guidance system) technology - asics design philosophy that employs linked componentry to enhance the foot's natural gait from heel strike to toe-off. | comfordry sockliner - removable sockliner that provides cushioning performance and moisture wicking for a cooler, dryer, healthier environment. | spevafoam midsole material - improves bounce back characteristics and decreases midsole breakdown. | guidance trusstic system technology - this trusstic system technology integrates guidance line construction for enhanced gait efficiency while providing midfoot structural integrity. | rearfoot gel technology cushioning system - attenuates shock during impact phase and allows for a smooth transition to midstance. | runners of all levels rely on the gt-1000 6 for its balanced support, enhanced durability and cushioned ride at an incredible value. The impact guidance system and guidance trusstic system help guide your stride so you maintain efficient form from start to finish. Weight: 10.2 oz. Heel height: 22mm. Forefoot height: 12mm.