Altra FootwearAltra Footwear - Instinct 4

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Put the miles behind you in the Altra Instinct 4 running shoe! ; Predecessor: Instinct 3.5. ; Support Type: Neutral. ; Cushioning: Lightweight, flexible response. ; Surface: Road. ; Differential: 0 mm. ; 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. ; FootShape 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. ; INNERFLEX grid-like midsole flex grooves add flexibility right where it's needed to promote speed and enhance performance. ; Ultralightweight Abound EVA midsole foam and a unique energy-returning compound work together to protect feet upon impact, and add sprint to each step. ; Foot Pod Technology 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 ; Imported. Measurements: ; Weight: 11 oz ; Product measurements were taken using size 12, width D - Medium. Please note that measurements may vary by size. ; Weight of footwear is based on a single item, not a pair.