Made from durable recycled & biodegradable materials with a new gender tuned fit and enhanced cushioning our next generation raises the bar, again. Reach for new standards in performance and comfort, and do it sustainably. An average shoe can take over 40 years to biodegrade, our Gravity 10 is specially treated to break down into nontoxic biomass & biogas up to 75% quicker in landfills while not compromising quality or performance in any way. Run these shoes into the ground, Mother Earth will thank you for it. The Newton Gravity 10 is a neutral running shoe with amazing Energy-return!