Bondage mitten
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Bondage mittens (sometimes called bondage mitts) are pouch-like coverings that fasten securely around the wrists, holding the hands in closed fists or palms flat. They are often used in BDSM play.
Unlike mittens for cold-weather use, bondage mittens are tubes or bags without a separate thumb and are typically made of leather or some other stiff material to prevent the wearer from grasping through the material of the mittens. With the 'palms flat' type they can either be stiff and close-fitting making it impossible to close the hand into a fist or supple allowing the hand to be bent over and fixed to the wrist. Both types often include a ring at the tip to which ropes can be connected for further tying-up.
Similar mitten-like devices exist for institutional use as patient restraints.