The sidi level cycling shoes deliver all the standard sidi details with a high quality fit and design the millenium 4 carbon composite sole provides more rigidity than a standard nylon sole the caliper buckle and velcro closure system provide a customised and adjustable fit for optimum comfort ad caliper buckle the micrometric closure is adjustable by lifting the central buckle in order to completely open lift together both side buckles or push the center button to slightly loosen o