The Grinder X features a dual zone EVA (50 rearfoot 55 forefoot) foam midsole and was engineered for dynamic, bodyweight-based agility drills and movements. It features a softer, grippier, feel for multi-directional movements such as jump rope, burpees, box jumps, jumping lunges, and more. It is a practical shoe for rowing, short distance runs and sprints. In life, there are grinders and non-grinders. We'll let you decide who we made this shoe for.