Sperry Bahama 2-Eye Synthetic and mesh Midsole Material: Acteva--Superior lightweight foam with exceptional durability. Made with DuPont Engage. 12% lighter than standard foam. Cushioning Technology: Abzorb SBS--Offers enhanced cushioning benefits through a unique cored design and superior material properties. Also provides an improved level of resistance to compression set for optimal results. Outsole: Blown Rubber Outsole--Blown rubber outsole provides a lightweight, cushioned ride. Model Number: mr859st Recommended Fit: These shoes run True to Size.