Made in the USA or ImportedRubber soleTORSION EFFICIENCY UNIT: Responsive without being overly supportive ÿ The Torsion Efficiency Unit brings sturdiness to the shoe. It is appropriately placed to generate maximal running efficiency.RECOIL MIDSOLE: The material in the midsole is a newly developed compound named RECOIL – which is a super lightweight cushioning compound that releases a high rebound energy effect.DROP 6MM: A shoe with a 22-mm thick heel and a 16-mm thick forefoot will have a 6-mm heel-toe drop. A higher drop (more than 6 mm) negatively interferes with your natural running stride and makes it hard to find a perfect running form.3 LAYER CONSTRUCTION: 1 layer of mesh material adds comfort, while the middle stabilizes lateral movements and reduces pressure on the foot. The exterior thin net mesh encapsulates and wraps up the front in a neat fashion, adding durability to the shoe.EXO SKELETON: It stabilizes the foot in lateral movements and relieves pressure at the MTP joints. It eliminates friction and reduces the impact of the side forces in the soft parts of the foot, especially underneath the forefoot.