Designed for speed and agility, Skechers GOrun 4 running shoes feature innovative technologies that promote a midfoot strike while offering cushion and impact protection. The soft, smooth fabric lining makes them incredibly comfortable to wear with bare feet. Plus, you can remove the insole for an even more minimal feel.Upper: Form fitting and virtually seamless sublimated mesh upper features lightweight overlays for an ideal fit and support. One-piece upper engineered to deliver a comfortable supportive fit. TPU side overlays with integrated lacing provide a supportive, secure fit.Midsole: M-Strike® Technology promotes a midfoot strike. Resalyte® Midsole is a proprietary lightweight injection-molded compound with memory retention to help absorb impact. Resalyte® Power Pillar™ cushioning provides a soft and responsive ride. Custom insole is removable for an even more minimal feel. Outsole: GOimpulse™ Sensors offer flexibility and feedback for a responsive running experience.