Adidas is iterating its popular Ultra Boost silhouette this year with the introduction of the 4.0 version of the shoe. While the brand hasn't debuted the model quite yet, there are preorders for a few colorways available through Road Runner Sports here.

The store has white, black, and multicolor pairs available, which should ship on Dec. 4.

The Adidas Ultra Boost 4.0 is different from previous forms of this sneaker in that it's got a linear knit treatment that runs from the toe to the collar of the shoe near the heel support cage.

Adidas' Ultra Boost first released in 2015 and has been on retail shelves ever since, its knit upper shifting every few seasons.

Adidas Ultra Boost 4.0 Black
Image via Road Runner Sports
Adidas Ultra Boost 4.0 Multicolor
Image via Road Runner Sports