ASICS GEL-Nimbus 18 GS Running Shoe (Little Kid/Big Kid) 100% Textile/Synthetic Imported Rubber sole Shaft measures approximately Low-Top" from arch Impact guidance system I.G.S ASICS design philosophy that employs linked componentry to enhance the foots natural gait from heel strike to toe-off Fluid ride provides the ultimate combination of bounce back and cushioning properties with reduced weight and exceptional durability Rear foot and forefoot gel cushioning systems attenuates shock during impact and toe-off phases, and allows movement on multiple planes as the foot transitions through the gait cycle Guidance line vertical flex groove decouples the tooling along the line of progression for enhanced gait efficiency Guidance truss tic this truss tic system integrates Guidance Line construction for enhanced gait efficiency while providing midfoot structural integrity