The adidas Ultra Boost Uncaged J 'Core Black' was introduced to the market in June 2016. This particular colorway is designed for juniors and features a visually appealing combination of black and grey speckled Primeknit material on the upper. It also includes a black sock-like collar and heel counter. The midsole is white and incorporates Boost technology for enhanced comfort and responsiveness. The outsole is made of black Continental rubber for excellent durability and traction.