A condition where calcium is deposited within muscle tissue. It usually occurs subsequent to a haematoma or bleed within muscle tissue, commonly known as a dead leg. It is also more likely to occur if massage is used too early in the treatment of a dead leg. This is because the pressure of the massage can re-start bleeding in the tissues, as the calcium deposits are derived from the blood clotting process. Neoprene Neoprene is a synthetic rubber polymer that is extremely wear resistant. It has thermal insulating properties which help to make it a perfect material for use as a joint or muscle support.