The FuelCell foam, with its HTML tags, provides a propulsive sensation that aids in driving you forward. The upper has been designed with no-sew construction to offer a seamless fit and comfortable feel. It is made with a combination of synthetic and mesh materials. The shoe has a 6mm drop, but please note that due to variations in the development and manufacturing process, this measurement is approximate. The TPU plate included in the design provides excellent propulsion and traction.