Substrate suitable for Leopard Geckos and other desert animals. A mixture of soil, sand and gravel provides a naturalistic environment. Absorbent. Encourages digging. 100% natural. This substrate mix can be found in the natural habitat of Leopard Geckos and is therefore a better match than the basic substrates available. The mixed particles allow for moisture retention when sprayed which creates moist areas that would naturally be found in burrows or burrows. Leopard Geckos seek out these moist areas when they change skin or require more moisture, so this in turn encourages burrowing.