The chairs are tested to 110 kg. If the user is heavier, the wear on the joints and supports increases. However not only the user's weight plays a major role in the wear and tear of the chair. Sitting habits are also important: If, for example, you regularly drops heavily into the chair, swing backwards on the back feet and/or use the armrests to stabilise yourself when getting in and/or out of the chairr this can be greater burden than one static, if heavier, user.