Altra FootwearAltra Footwear - Duo

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Hit the ground running in the Altra Footwear Duo Racing Shoes. ; Ideal for running, road racing, speed work. ; Support Type: Natural. ; Cushioning: High-energizing cushioning. ; Surface: Road. ; Differential: 0 mm. ; Altra recommends those new to natural running and zero-drop footwear should transition slowly by wearing these on shorter runs and gradually building up to regular mileage. ; Altra Zero Drop Platform : • Heel and forefoot are equal distance from the ground. • Promotes proper form to reduce initial impact. • Natural Achilles loading for enhanced propulsion. • 1:1 ratio naturally aligns feet, back, and body posture. • Weight-balanced from front to back. ; Super-thin mesh upper for enhanced breathability. ; Lace-up closure. ; Padded nubuck-pillow tongue. ; Breathable DriLex lining. ; Removable 6mm Contour Footbed. ; Lightweight injection molded foam midsole. ; FootShape Toe Box allows toes to splay naturally. ; Blown-rubber outsole. ; Last: HFS. ; Imported. Measurements: ; Weight: 9 oz ; Product measurements were taken using size 11.5, width D - Medium. Please note that measurements may vary by size. ; Weight of footwear is based on a single item, not a pair. ; Proposition 65 WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.