Internal midsole for low to ground shock absorption Pumagrip rubber outsole for all surface traction Rubber wrap ups for overall stability Fuse Flex vertical grooves to provide improved metatarsal foot splay New last for a wider, stronger stance Puma Worked With Professional Athletes To Amplify Three Key Training Attributes,Stability And Traction. The Fuse 2.0 Features Increased Rubber For Enhanced Stability, Including Higher Sidewall Coverage To Ensure Traction And Grip. The Streamlined Upper Construction Provides Durability For Rope Climbs, While A Lightweight Thermoplastic Polyurethane Heel Clip Is Designed For Handstand Push Ups. And All This Innovation Comes In One Sleek Package To Help You Reach Your Ultimate Training Potential.