You will enjoyrr choice of one lava shell massage treatment from the selectionr full body massage orr core strength orr relaxing massage r r lava shell massage uses heated sea shells for a super relaxing massage the heat comes from inside the lava shells due to a mixture of minerals and algae with salt water and essential oils when they combine within the shell it creates a chemical reaction that creates heat for up to 2 hours lava shells help tensed muscles relax and smooths out knots