Adidas Porsche design sport bounce S4. Men’s size US 12. Shoes are brand new but missing the box. Original MSRP was $520. Porsche Design Sport by adidas streamlined its award-winning BOUNCE TM technology to create a lighter, more elegant spring system. These men's BOUNCE TM:S4 training shoes feature a mesh upper with aerodynamic-inspired 3D debossed lines and high-tech carbon plate and polymer details supplied from the automotive industry.