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Give into the impulse to blaze down the city streets in the dynamic response of the Altra Zero DropTM Instinct 3.5 running shoe! Altra Zero Drop recommends that those new to natural running and zero-drop footwear transition slowly by wearing these on shorter runs and gradually building up to regular mileage. Built for the neutral runner seeking moderate underfoot cushioning. Ideal for running, ultramarathons, long distance walking, and cross training. Designed to improve running form, toe splay, stability, and power. Breathable, quick-drying mesh and synthetic upper materials. Lace-up closure. FootShapeTM toe box allows the toes to relax and spread naturally for optimal comfort, speed, and stability. Lightly padded tongue and collar. Breathable fabric lining offers a great in-shoe feel. Removable 5 mm foam insole. Natural Ride System blends outsole and midsole componentry, along with anatomical design, the Zero Drop platform and foot-shaped last to promote a more natural stride. Zero Drop construction places the heel and forefoot at the same distance from the ground to encourage natural, low-impact running form. INNERFLEXTM grid-like midsole flex grooves add flexibility right where it's needed to promote speed and enhance performance. Ultralightweight Abound EVA midsole foam and an unique energy-returning compound work together to protect feet upon impact, and add sprint to each step. Foot Pod TechnologyTM consists of an outsole and midsole layout that maps the foot's bones and tendons for more natural flexibility. Total Stack Height (total thickness of midsole and outsole underfoot): 24 mm. Product measurements were taken using size 8.5, width D - Medium.