Our most comfortable running shoe of all time! The U-TECH Aion 4 combines heavenly cushioning, dynamic roll-off, and a perfect fit to create a uniquely smooth running experience. The new True Motion Transparent Hybrid Foam, the newly developed Apex Rocker, and the new memory foam insole ensure maximum comfort – from relaxed daily runs to long runs and ultra marathons. Designed for healthy running with up to 50% fewer running injuries thanks to patented U-TECH™ Technology.