Tribe Switch

A Tribe Switch (also known as Tribe Shuffle or Tribe Swap) is a game-changing twist of Survivor. This twist sends members from one tribe to the rival tribe and vice versa. It is a regular twist which appears in most seasons, and was first witnessed in the first season Morocco

About
The Tribe Switch is a twist that can happen in a specific point during a game. This reassignment of tribes is effective until the tribes merge or a new opportunity to switch tribes occurs (e.g. a mutiny or a second switch.) This is denoted by contestants wearing a newly supplied buff in the color of their new tribe. They then drop their old buff on the ground and start wearing the new one. Normally a swap would send half of the members of a tribe to the other when both tribes have an equal number of members, although this varies when there are unequal numbers and can lead to one original tribe having a numbers advantage over the other.