Design: Perforated faux leather upper combines a timeless look with ventilated comfort Co-created by On and Roger Federer CloudTec® technology brings next-generation comfort to this iconic tennis-inspired silhouette In-Shoe Comfort: The hidden Speedboard™ brings elite-level energy return to the all-day shoe Sock construction delivers our signature step-in sensation and distraction-free comfort Additional Details: 7 mm Heel to Toe Drop Total Recycled Content: about 5% (Polyester: about 25% recycled) Other Features: – Synthetic leather upper