Ryka Women's Revive 2 100% Mesh and leather Rubber sole Midsole Material: Compression-Molded EVA--The EVA material is heated, reducing the density, for a lighter weight. Outsole: Solid Rubber Outsole--Solid rubber outsole provides durability and traction. Cushioning Technology: Nitracel Engage Foam--Nitracel Engage Foam delivers optimal cushioning and rebound. Model Number: K21048WSPO Classification: Cushioning