An armbinder is a bondage toy that is used to restrict movement to the arms. Popular types of armbinders are straps down the back connecting from a choker around the neck down to the wrists, or a monoglove, which is similar to a corset.
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If you’re keen to try having your arms restricted, start small with a tie or scarf and get used to the sensation before moving on to more restrictive bondage. Make sure that you trust the partner you’re playing with to untie you if you start feeling uncomfortable or discuss a safeword before you start.