Specifically designed to be used in dry and arid environments such as Bearded Dragon terrariums. Each bag contains finely ground tree fern fiber, milled long fiber sphagnum moss, milled sphagnum peat moss, fine charcoal, fine fir bark, and calcium sand. Each bag is made individually guaranteeing the correct ratios. This precise combination allows for superb drainage leading to a substrate that will not easily become compacted or anaerobic in terrarium conditions.