Blood Warmers are designed to warm the blood at the pulse points your body so the blood is pre-warmed before moving into your hands where it can be of most use and, most importantly, felt. Instead of warming the hands directly where the blood leaves the hands returning to the body taking the heat with it. Blood Warmers warm the blood at the pulse points before going into the hands. The heat is transferred to the blood at the pulse points and be felt by the user were they want it most, in the hands.