Men\'s shoes. Suede overlays. Water-repellent nylon. Mesh. Reflective details. Synchron lacing system. Double density midsole. Air cushion. Stylist Notes. The Synchron made its first appearance in 1980, introducing a unique lacing system in the toebox that set this shoe apart from other footwear. The innovative design aimed to provide a better fitting upper for added comfort and durability.