From the website: Cloudmonster Featuring our biggest CloudTec® ever for massive cushioning and max energy. A monster of a ride on the road. Technology Monster CloudTec® Running never felt like this. Our biggest Cloud elements ever meet an ultra powerful Speedboard®. The result? Extremely soft landings and maximum rebound, for energy return you won't believe. This is running on Clouds with the volume turned up. Materials Wild for the ride A monster of a sensation meets big performance. Light, durable and temperature resistant. A bold rocker shape and easy step-in make running pretty much irresistible. The soft sockliner and upper turn recycled materials into next-gen comfort so you're ready to run wild. Or should that be weird? Design Weird for a reason The Cloudmonster is different, that much is obvious. Designed to be the ultimate CloudTec® experience, it propels you forward stride after stride. It's perfect for energizing any run from an easy 5K to a big-effort 20. It may be a playfully weird ride, but it's definitely serious about performance.