Ecco Receptor - Cairo (Navajo Brown/Black) - Men's: Oiled full grain nubuck and Neoprene upper. Receptor technology. Internal Exo-Skeletal wrap around shank support. Compression molded Phylon midsole treated with an Anti-bacteria formula. Omni-directional lugged rubber outsole. Anatomically correct angle of attack heel stike zone. Dual Axis forefoot flex channels.