A comfort clamp assembly for a vehicle occupant restraint system clamps the shoulder belt against retraction by the shoulder belt retractor so that the belt can be positioned at a nontensioned length with respect to the chest of the seat occupant. According to the invention a clamp lever is pivotally mounted on a guide member and is selectively movable between a belt clamping position and an unclamping position. A spring acts between the clamp lever and the guide member and goes overcenter upon pivotal movement of the clamp lever between the belt clamping position and the unclamping position so that the tension of the spring acts to maintain the clamp lever at its set position.