Steam Mask is one of the three skins released in the third part of the Mad Gears Shop offer. It could be collected for free in late February 2018.
Steam Mask could be acquired in the Skins Shop under the ‘Free’ tab. This skin was not available for purchase and there may be limited opportunities to acquire it in the future.
Details of this skin may vary depending on location, platform or time.
Note: The third part of the Mad Gears Shop offer was released again for limited times in mid January 2020 and then in early March 2021. Steam Mask could be collected for free again for each of these releases.