From the On website: Light. Responsive. And seriously quick. Lead training or racing in a shoe that's fast for everyone. Weight: 200g Lightweight woven upper for next-gen speed and breathability Ultra-responsive cushioning sensation with Helion™ superfoam Inspired by our fastest shoe, the Cloudboom Echo Irresistible forward-roll for picking up the pace *Well cared for in a smoke-free and pet-hair free environment