In the Buff™ is a premium double-sided pumice stone crafted from the highest quality siliglass. A coarse gray side features large open pores to remove hardened calluses, corns and dead cell buildup, while a finer textured white surface buffs and smooths more sensitive areas on rough, dry skin. In the Buff™ is a premium double-sided pumice stone crafted from the highest quality siliglass. A coarse gray side features large open pores to remove hardened calluses, corns and dead cell buildup, while a finer textured white surface buffs and smooths more sensitive areas on rough, dry skin. Barefoot Scientist creates innovative, effective products that make it easy to treat your feet in the same specialized way that you care for your face, hair, and body. From hydrating creams to gel-infused socks, each hypoallergenic, dermatologist-tested, and vegan formula is made to help you put your best foot forward.