The GEL-GLYDE™ 4 shoe is a versatile stability trainer that's functional for various distances.We've updated the midsole to make it softer,more supportive,and more responsive.FLYTEFOAM™ PROPEL cushioning is strategically positioned in the midsole to help create smoother landings and a more energized rebound at toe-off.LITETRUSS™ technology is positioned on the inside of the midsole to improve stability.It helps prevent your foot from rolling too far inward,setting you up for a smoother stride.