Newton Sir Isaac S Running Shoe - Mens 14 D(M) A stability guidance runner designed for everyday training and slow-paced running. It is the most traditional, structured and supportive shoe in the Newton line, and is designed to help runners new to the natural running experience. Highly breathable closed mesh upper. Lightweight ergonomically placed synthetic overlays Metatarsal stretch panels. Single-density, high-rebound EVA midsole. Second-Generation Action/Reaction Technology: A highly responsive, trampoline-like and engaging midsole cushioning that protects and loses less energy with each step.