- Primeknit designed to expand with foot for a closer fit.
- Featherweight sockliner for added comfort.
- boostâ's properties return energy with every step.
Engineered with advanced footwear technology, the Adidas Ultra Boost is a
serious running sneaker. Featuring a slip-on bootie design, they have a
flexible Primeknit upper, Boost energy-returning cushioning, external heel
counter, and a STRETCHWEB rubber outsole.