The Hoka One One Women's Kailua Trail has up to 2.5x the volume of EVA in the midsole compared to standard running shoes. Outstanding impact absorption and a highly comfortable underfoot feel. This oversized approach ensures a natural stride whether on smooth road surfaces or the most uneven trails. The shoe also has a unique rolling motion which delivers superior underfoot performance. A 50% rockering profile to provide a smooth, energy efficient stride transition from the heel strike to the push off. It is this progressive motion that propels you forward with each and every strike of the foot.