This is what the product literature says: Rock on with a gel-based scrub that uses exfoliating volcanic rock to slough off rough, callused skin for soft, sandal-worthy feet. Best for: all skin types How it works: Community Trade peppermint oil promotes a cooling sensation to leave feet feeling refreshed and helps to combat odor. Pumice granules from volcanic rock are intensely exfoliating to smooth and soften even the roughest skin. Menthol further cools skin to leave it feeling refreshed.