Lava Shells are the world’s first naturally self-heating massage tools designed to allow a massage therapist, or anyone performing some type of bodywork, the ability to add heat into their techniques. The Shells offer relief to the masseuse’s hands and wrists and allow for deeper tissue work, being the world’s most powerful heated massage tool. Our Lava Shells use a heating technology combined with an all-natural heat absorber called Lava Gel. The activator reacts with the natural minerals in the Lava Gel sachet and causes an exothermic reaction, creating a relaxing heat that is absorbed into the Lava Gel. Once activated, a shell will continue to generate heat for up to an hour, giving you the same heat as a full hot stone massage with just two shells – no electricity of equipment needed.