If you care 100 natural sponge cloths are made in a patented process from a three dimensional blending of cellulose non gmo umbleached cotton and mirabilite ndash a natural mineral salt during the production process the mirabilite is washed out leaving the remaining blend 70 cellulose amp 30 cotton extremely porous which makes the sponge cloth extraordinarily absorbent it can absorb up to 20 times its own weight in water 70 cellulose and 30 unbleached non gmo c