Strengthen your body with ST-4, built to deliver lightweight, natural performance for in the gym or on the run. The zero drop 16 mm platform provides a minimal, flexible fit for optimized ground feel and natural foot mechanics. The breathable mesh upper keeps the foot cool, while printed overlays and an internal skeleton lining offer increased security throughout. The relaxed heel construction provides a more natural fit and allows the shoe to pack flat in a gym bag or for travel. A newly added OrthoLite® footbed provides long-term comfort and odor resistance in these natural running shoes.