The GT-1000? 13 GS (Grade School) shoe is a versatile stability trainer that's functional for various distances. We've updated the underfoot cushioning to make it feel more comfortable and energetic. A kid's-specific last and a sockliner size checker helps to accommodate growing feet. Additionally, the medial forefoot wrap-up outsole and toe rubber stitch are designed to improve durability. Lastly, GEL? technology provides comfortable cushioning throughout the day.