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An exothermic natural massage shell includes a natural bivalve shell comprising a first half and a second half adhered together with an adhesive to form a hollow chamber. An aperture is formed in the first half to provide a portal to the hollow chamber of the bivalve shell. A reactant is disposed in

An exothermic natural massage shell includes a natural bivalve shell comprising a first half and a second half adhered together with an adhesive to form a hollow chamber. An aperture is formed in the first half to provide a portal to the hollow chamber of the bivalve shell. A reactant is disposed inside the hollow chamber of the bivalve shell. The reactant may be a reactive powder mixture disposed inside a fluid-permeable pouch. Combining the reactant with an activator inside the hollow chamber of the bivalve shell causes an exothermic reaction that heats the bivalve shell and maintains the bivalve shell at a substantially constant elevated temperature for a duration of time. The adhesive adhering the first shell half to the second shell half includes a first elastomeric polymer bonding agent with balanced coefficient of expansion properties and a second flexible resin sealant that makes the adhesive moisture-proof.

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1. An exothermic natural massage shell, comprising: a natural bivalve shell comprising a first half and a second half adhered together with an adhesive to form a hollow chamber; an aperture formed in the first half to provide a portal to the hollow chamber of the bivalve shell;an exothermic reactant

1. An exothermic natural massage shell, comprising: a natural bivalve shell comprising a first half and a second half adhered together with an adhesive to form a hollow chamber; an aperture formed in the first half to provide a portal to the hollow chamber of the bivalve shell;an exothermic reactant disposed inside the hollow chamber of the bivalve shell, the reactant being removably inserted through the portal;wherein the reactant is combined with an activator inside the hollow chamber of the bivalve shell which causes an exothermic reaction that heats the bivalve shell and maintains the bivalve shell at a substantially constant elevated temperature for a duration of time, the hollow chamber and the portal being reusable for repeated exothermic reactions wherein addition of water to the reactant inside the hollow chamber creates an exothermic gel that transfers heat to one or more walls of the halves of the natural bivalve shell; andwherein the adhesive adhering the first half of the bivalve shell to the second half of the bivalve shell comprises a first elastomeric polymer bonding agent with coefficient of expansion properties operable to maintain first and second halves securely adhered through repeated heating and cooling cycles and a second flexible resin sealant that makes the adhesive moisture-proof. 2. The exothermic natural massage shell of claim 1, further comprising a cap engaged with the aperture formed in the first half, the cap having a valve that sequesters the reactant and activator inside the hollow chamber while allowing gas flow out of the hollow chamber. 3. The exothermic natural massage shell of claim 2, wherein heated air or vapor produced by the exothermic reaction escapes through the valve. 4. The exothermic natural massage shell of claim 1, wherein the reactant is contained within a water-permeable pouch inside the hollow chamber. 5. The exothermic natural massage shell of claim 1, wherein at least a portion of an outer surface of the bivalve shell has an abrasive texture. 6. The exothermic natural massage shell of claim 1, wherein at least a portion of an outer surface of one or more walls of the natural bivalve shell has a smooth texture. 7. The exothermic natural massage shell of claim 1, wherein an outer surface of the bivalve shell includes at least two portions, each with a different radius of curvature. 8. The exothermic natural massage shell of claim 1, wherein the outer surface of the bivalve shell includes at least two portions, each with a different texture. 9. The exothermic natural massage shell of claim 1, further comprising a cap detachably engaged with the aperture formed in the first half. 10. The exothermic natural massage shell of claim 1, wherein the first and second halves are each formed with different curved surfaces and associated radii. 11. An exothermic natural massage shell, comprising: a natural bivalve shell comprising a first half and a second half adhered together with an adhesive to form a hollow chamber; an aperture formed in the first half to provide a portal to the hollow chamber of the bivalve shell;a fluid-permeable pouch disposed inside the hollow chamber of the bivalve shell, the fluid-permeable pouch being removably inserted through the portal and containing a reactant;wherein the reactant is combined with an activator inside the hollow chamber of the bivalve shell which causes an exothermic reaction that heats the bivalve shell and maintains the bivalve shell at a substantially constant elevated temperature for a duration of time, the hollow chamber and the portal being reusable for repeated exothermic reactions wherein addition of water to the reactant inside the hollow chamber creates an exothermic gel that transfers heat to one or more walls of the halves of the natural bivalve shell; andwherein the adhesive adhering the first half of the bivalve shell to the second half of the bivalve shell comprises a first elastomeric polymer bonding agent with coefficient of expansion properties operable to maintain first and second halves securely adhered through repeated heating and cooling cycles and a second flexible resin sealant that makes the adhesive moisture-proof. 12. The exothermic natural massage shell of claim 11, wherein the fluid-permeable pouch is a water-permeable non-woven polypropylene pouch. 13. The exothermic natural massage shell of claim 11, wherein the fluid-permeable pouch is a paper-based pouch. 14. The exothermic natural massage shell of claim 11, wherein the activator is a liquid solution, and wherein a mixture of the reactant and the activator is sequestered inside the fluid-permeable pouch.