adidas Ultra Boost! adidas is completely revolutionizing the running game with this shoe. They promise a never before known feeling of cushioned, fast and comfortable and we can only confirm that. Boost foam in the midsole has a responsive ground feel and will keep it's form in the coldest weather. This adidas Ultra Boost Uncaged in black and white has a seamless stretchy prime knit upper and the well known Torsion system to support your mid foot. Natural running motion at it's best!