3D Stretch TechLoom upper features an intricate grid pattern designed to move with your feet Neoprene tongue with integrated collar offer exceptional fit and all-day comfort in a sleek, low cut silhouette. Midsole/outsole compound developed for direct ground contact, enabling the use of less rubber on the outsole, significantly reducing the weight of the shoes. Propelium® is designed to maximize energy generation and provide superior comfort that will maintain midsole structural integrity longer than conventional EVA. Inspired by the shape of a feather, the outsole incorporates natural motion flex grooves that react to every movement. 100% Vegan, made using no animal products. The 8mm drop from the heel to the forefoot places your foot in a natural position for efficient running.