In January, the authors of Tom Clancy's Rainbow Six Siege X launched the winter event "Freeze For All".
Players are invited to participate in a competitive mode, in which everyone fights for themselves. The battle takes place on the Artic Workshop map: skulls fall out of defeated opponents, and points are awarded for collecting them.
A collection of thematic "winter" skins is available in Tom Clancy's Rainbow Six Siege X — for weapons, as well as operators: