A wrist restraint is a cuff or shackle meant to restrain the movements of a person's arms and hands.
Wrists can be tied in many different ways: in front or behind the body, to ankles, to thighs, to bedposts, to chair arms, to spreader bars, to walls, to sex machines, and to other objects. Those who enjoy wearing wrist restraints enjoy the loss of control, the sensation of being restrained, and even the sensation or friction provided by the restraints themselves.
Example of wrist ankles. Pictured is the Sportsheets Cuffs and Blindfold Set.