Ryka Women's Revive Running Shoes asymmetrical upper support combined with lateral heel shock absorption for an ultra-smooth, heel-to-toe transition. Features ultra-light running shoes packed with innovative performance technology for the moderate runner. Combination leather, air mesh, and high density foam upper. Padded collar with heel pull loop. Fabric lining with removable, molded Nitracel sockliner. EVA strobel board. Lightweight, compression EVA with N2-DM at lateral heel provides energy return, rebound and impact protection. Infused Heel Clip Guidance offers stability and control. Tri-piece solid rubber with balanced traction and forefoot flex grooves delivers extra flexibility.