They're supersleek on the outside �C clean-styled, crafted in butter-soft premium nappa leather �C they're sneaker-comfortable inside. Flexible, featherlight, with anatomically contoured footbeds that give natural support, and our high-rebound Dynamicush? cushioning cleverly hidden in the 'flat soles'. Upper Material - Leather. Lining Material - Microfibre (Upper), Leather Footbed. Fastening - Slip-On. Outsole - Slip-Resistant Rubber. Technology - Dynamicush