adidas introduced the grey variant of the Ultra Boost Uncaged in May 2017. This edition of the Ultra Boost eliminates the midfoot TPU overlay, while ensuring the integrity of the heather grey Primeknit upper through an internal support system. The flat laces, designed and arranged in tiers, offer improved comfort and stability. The heel stabilizer maintains the grey color palette, while the Boost midsole and Continental Rubber outsole provide striking white and black contrasts.