The upper of the shoe is made of lightweight compression mesh and offers excellent breathability and style. HOVR ™ technology provides zero gravity to maintain energy return, which helps eliminate shocks step by step. The built-in Record Sensor™ records and analyzes virtually all running metrics - distance, pace, stride length, cadence and, when connected to the Map My Run app on your phone or smartwatch, even in real time. External heel panel for increased stability and locking the foot in the shoe. The massive sole covers the most stressed areas. The combination of carbon and rubber liner under the heel provides ideal traction and durability. Highly reflective material elements are used for safe training even in low light conditions. Material: 99% Textile, 1% Synthetic Fibers