Design: Primeknit speed cut minimalistic low cut collar construct optimized for easy instep and snug fit around the ankle Laceless vacuum fit a new 4-way stretch material allows for easier step in and provides secure lock down Engineered agility cage maximum support during explosive movements and radical change of direction through laser cut TPU cage purposefully re-enforcing the upper material from the inside Sprint spike silhouette no need to get ready you can just go with a newly engineered last with a slight toe spring puts you in a sprinter stance 3D molded heel cushion inserts with an anti-slip lining provide comfort and lockdown to prevent hell slippage Speedflow branding new fast branding on the lateral side deeply rooted in adidas speedboot legacy Made with a series of recycled materials, this upper features at least 50% recycled content Durability & Traction: Carbon fiber speedframe ultra lightweight construct with revolutionary carbon fiber insert in the forefoot allows for more efficient power transmission when accelerating and sprinting, providing a real performance benefit New stud configuration is optimized for acceleration