A surgical robot drape for enveloping a joint of a surgical robot, the joint configured to permit axial rotation of a part of a robot arm adjacent the joint about a joint axis, the drape comprising a proximal drape material portion configured to provide a sterile barrier over, and to be rotationally fast with, a part of the robot proximal of the joint, and a distal drape material portion configured to provide a sterile barrier over, and to be rotationally fast with, a part of the robot distal of the joint； the drape being configured such that the proximal and distal drape material portions are freely rotatable relative to one another about the joint axis.
