https://wiki.teamfortress.com/wiki/Pyrovision_Goggles
The goggles were distributed in Vintage quality to all players who launched the game before July 5, 2012, further characterized with the added positive attribute, "Witnessed the 2012 inferno". Alternatively, a Unique version of the item can be awarded to the player by completing the A Fresh Pair of Eyes achievement obtained by dominating a player who is wearing the goggles, similar to obtaining the Ghastly Gibus hat.
google is friend