Elblag - Men's Black and Blue Calf Leather Derby Shoe feature a open lacing system and Rubbery sole. A black and blue calf leather derby shoe with a Rubbery sole is a combination of style and refinement. The Rubbery sole is known for its durability and grip, making it ideal for all weather conditions. The black and blue color provides a classic and versatile look. These derbies are suitable for both formal occasions and everyday wear.