Mastermind x EQT Support Ultra Mystery Ink Sneakers released in September 2017 as a result of a larger collaboration between Adidas and Mastermind World. The retro-inspired upper features a mix of mesh and leather with Mystery Ink detailing and contrasting White.. about Mastermind branding in the sidebar. Underfoot, white Boost unit provides cushioning , while more Mystery Ink is applied to the outsole.