Focusing on your back, neck and shoulders this is the treatment for anyone with tense muscles in these areas. The heat from the Lava Shells will gently relax and smooth away knots. The Lava Shells owe their magic to a mix of minerals including dried sea kelp, dead sea salt, algae and essential oils. The heated shells also give off calcium ions, which transfers to your skin during the massage. Calcium can help to firm and regenerate the skin - a nice bonus.