RYKA Women's Nalu Running Shoe 100% Mesh, Synthetic Imported Rubber sole Weight is 8.1 oz Upper is breathable mesh with molded eva external heel counter and synthetic overlays. Independent lycra comfort cushion collar. Precise-return footbed Midsole is tri-density eva midsole delivers support, cushion and flexibility where she needs it. Durable abrasion grade eva in midfoot and rubber in heel and forefoot for durability and traction.