The Puma Complete Calibus is a lightweight and very flexible minimalist training shoe designed by the Puma running shoe. It is specifically designed for underpronators and neutral runners and those who are light footed and have an efficient midfoot strike pattern. It’s snud, secure, glove fit around the midfoot and compact toe box make it one of the closest fit around the midfoot. The midfoot and forefoot are flexible, agile and responsive which makes it an ideal marathon running shoe. Runners with even a mild amount of pronation in their gait should stay away from this shoe. The nylon mesh upper is highly breathable and provide excellent ventilation.