“A super shoe made for marathon runners of all levels. With responsive, max cushioning to help you reach the finish line.” Key features Weight: 250g Double layer of Helion™ HF hyper foam for energy and comfort Glass fiber-infused Speedboard® for efficiency and support Impact protection and high energy return Ultralight and breathable upper Heel cushioning for secure comfort over long distances Supportive upper molds and adjusts to your foot's movements Rubber outsole for grip on the road Engineered for finishing times of around four hours or more