The Gel-Nimbus 20 shoe has a flexible vertical groove that decouples tools along the progression line to improve gait efficiency. The exoskeletal heel counterweight provides improved support and creates an improved heel fitment environment. It has a gel cushioning system for rear hind and forefoot, that reduces the impact during the detachment phases and allows the movement on several levels while the foot passes through the step cycle.The material of the speva midsole improves the characteristics of rebound and reduces midsole breakage. It has a new blown ahar outsole that offers advanced cushioning, durability and foot stroke, in addition it is built with the innovative midsole foam, flytefoam. Its organic fibers bounce metarun provide a perfect cushioning from the beginning of the stroke to the end.It is designed with a 3 m reflective material, for visibility.