The Gel-Kayano 12.1 features a modern tooling system integrated with design elements from the 2006 original. Open mesh underlays facilitate airflow, while the midsole incorporates the tooling system from the Gel-Nimbus 17. Engineered for marathon comfort, the construction includes dual Gel technology inserts and a Fluid Ride cushioning structure. breathable mesh underlays Gel-Nimbus 17 tooling system Fluid Ride technology rearfoot and forefoot Gel technology dope dyed recycled sockliner mesh
