ALDO Men's Cortleyflex Lace-up Derby New Sole Design: We redesigned the soles with more flex in key areas where the feet bend the most. The end result is a shoe that has more natural motion than the rest. Handsome from heel to toe, these smooth leather derbys always make you look put together, no matter the occasion. Featuring a flex sole for added comfort, these dress shoes know how to maneuver the dance floor with ease (and style!)