Cloud Flow: Lightweight, fast and exceptional cushioning. Provides a comfortable fit from training to racing. Cloudflow is the shoe for all runners with technology for Ellie Runners. Helion? Super Foam CloudTec? which provides extra cushioning to absorb road shock while allowing you to feel the land instantly. The mesh upper with a special mesh construction ensures a secure fit whether training or racing. Updated upper looks sleek and seamless for improved comfort. Not only is it stylish, it is also made of 74% recycled polyester for the environment. Exquisite position rubber pads provide high grip when bending corners at high speeds. Sizing Feeling: True to size chart.