The Gel-Kayano 12.1 incorporates design elements from the 2006 original alongside a modern tooling system. The upper draws inspiration from gothic armour, featuring structural, metallic properties and open mesh underlays for improved airflow. The midsole utilises the tooling system from the Gel-Nimbus 17, engineered for marathon comfort with dual Gel technology inserts and a Fluidride cushioning structure. breathable mesh underlays Gel-Nimbus 17 tooling system Fluidride technology rearfoot and forefoot Gel technology dope dyed recycled sockliner mesh
