This shoe was crafted and enhanced for runners who love a cushioned running experience that almost feels like floating. Foam Wave: Wave construction consisting of multiple midsole materials designed to provide softer landing, smooth transition, and stable feeling.  Eco Friendly Materials: Recycled materials MIZUNO ENERZY NXT Nitrogen Infused EVA version : The MIZUNO ENERZY NXT Nitrogen Infused version combines the high cushioning, resilience, and lightweight properties to provide runners with an unprecedented smooth running experience. X10 Outsole: Durable carbon rubber that allows for longer wear. Gusseted Tongue: Stretchy tongue lining that hugs the foot securely and comfortably without any stress. Smooth Stretch Woven: Designed to control stretching direction for running motion and performance. Smooth Stretch Woven adapts to your foot and keeps your foot position correct.