The "Mystery Grey" Ultra Boost LTDs are back.

Before this weekend's Consortium Tour Ultra Boost release with Solebox, adidas is treating 'heads to a restock of one of the most popular—and hardest to find—colorways of the beloved runner. This particular colorway has been given a few nicknames, including "Iron" and "Solid Grey," but what really matters is they're super clean and easy to wear.

This make up is equipped with a heathered charcoal Primeknit upper and a full-length Boost midsole. A small hit of gold accents the Ultra Boost branding at the heel cup, while a Continental rubber outsole adds durability.

These aren't going to last long. Cop 'em now while there's still sizes available for $180 from adidas.com.