Made from sustainable maritime pine and sphagnum moss, Exo Terra Rain Forest Terrarium Substrate 24 Quart and 8 Quart is the ideal decorative substrate to create natural planted terrarium set-ups for humidity-loving reptiles, amphibians and invertebrates from tropical rainforest environments. The Rain Forest substrate regulates the terrarium's humidity in a natural way by absorbing and slowly releasing moisture. The hygroscopic properties are maximized by adding natural sphagnum moss to the mixture. Adequate air humidity levels aid in shedding and help prevent respiratory infections. The unique size and shape of the bark particles, in combination with natural sphagnum moss, allow frequent irrigation of your plants while still providing good aeration for healthy root growth.