As part of our kaizen (“continuous improvement”) design philosophy, the GT-2000™ 13 shoe builds upon its predecessor and introduces some key upgrades. What's new: A breathable engineered mesh upper for improved comfort and a better fit Increased cushioning in the forefoot for a more comfortable ride A new heel pull-tab for an easier step-in experience What’s familiar: The 3D GUIDANCE SYSTEM™ for adaptive, on-demand stability A combination of PureGEL™ technology for cloud-like softness and FF BLAST PLUS™ foam for lightweight, energized cushioning An increased heel bevel and forefoot flare for smooth heel-to-toe transitions