The Adidas Ultra Boost ST replaces the more standard Adistar Boost as the premium model from the german brand for runners looking to correct overpronation. It is an evolution from its counterpart for neutral runners the well known Ultra Boost and there is available a limited edition named GLOW plenty of 3M™ reflective elements for improved visibility under poor light conditions.
Upper is made of lightweight, highly elastic Primeknit material for comfortable fit. It adapts to foot's natural expansion and reduce friction for smoother ride. For better fit the Ultra Boost ST includes a midfoot plastic cage decorated with 3 stripes logo to secure the foot and changes in fabric's density at the vamp. Although heel counter is slightly smaller than in Ultra Boost it provides a good stability combined with TPU unit embedded in the midsole (Torsion® System) supporting the foot's natural rotation while running. Its open and ergonomic design (S-Curve) allows natural movement and takes care of those with sensitive achilles.
Outsole in Ultra Boost ST keeps the web design to stretch with runner's foot strike and movement featuring more rubber in inner side which is supposed to be more exposed. Regarding overpronation control Adidas has engineered a full length multidensity Boost™ midsole with the challenging task to keep responsiveness and cushioning properties while providing progressive pronation correction. We will need to wait until unbiased tester reports are available to confirm that assertion.