Pumice is probably the single most popular exfoliant on the market today. It is also used in the manufacture of stone wash jeans, certain concrete, toothpaste and more. Pumice can be added to lotions, gels, soaps and more. It is actually volcanic ash which is formed from lava that is permeated with gas bubbles while it solidifies. Since lava has similar properties and chemical characteristics to glass, pumice is very abrasive. However, unlike glass, it is also very soft. Pumice is the softest abrasive media in use today which is what makes it so popular. It is all natural.