The GEL-KAYANO™ 12.1 sneaker combines iconic design details from the version that launched in 2006 and harmonizes them with a modern tooling system. This design's upper was inspired by European gothic armor and its structural, metallic properties. The upper also features a combination of sporty emboss synthetic leather overlays sporty open mesh underlays that help keep feet cool and comfortable. The midsole features the same tooling system as the GEL-NIMBUS™ 17 shoe. It was originally engineered for comfort during the marathons, featuring dual GEL™ technology inserts and a FLUIDRIDE™ cushioning structure. Inspired by the GEL-KAYANO™ 12 running shoe from 2006. Breathable mesh underlays. GEL-NIMBUS™17 tooling system. FLUIDRIDE™ outsole The outsole material is blended with EVA and rubber to help provide comfort and traction without sacrificing durability. Rearfoot and forefoot GEL™ technology Shock-attenuating material placed in the midsole of the shoe for cushioning and shock absorption. The sockliner is produced with the solution dyeing process that reduces water usage by approximately 33% and carbon emissions by approximately 45% compared to the conventional dyeing technology.