The adidas Ultra Boost Uncaged Black Grey Three is a variation of adidas’ Ultra Boost line of running shoes built without the '3-Stripes' logo midcage. With a grey and black colorway and a white midsole, its upper is constructed from Primeknit, while its outsole is made from rubber, featuring full-length Boost technology in the midsole. This sneaker is notable for being the first Ultra Boost released without the cage, providing a sock-like fit. A sock-like collar around the upper ensures a snug and comfortable fit, while black plastic along the heel helps contour the shoe to the foot for ultimate performance. Experts appreciate the ultra-comfortable fit and performance capabilities of the adidas Ultra Boost Uncaged Black Grey Three, originally released on June 7, 2017, at a retail price of $180.