The Exo Terra Rain Forest is a 100% natural, biodegradable reptile substrate mixture made from sustainable Maritime Pine & Sphagnum Moss. Rain Forest Terrarium Substrate 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. Its 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. Exo Terra Rain Forest is heat-treated to reduce bacterial contamination. Key Features : 100% natural Ideal for rainforest terrarium set-ups Controls air humidity levels naturally Perfect for humidity-loving reptiles, amphibians and invertebrates Heat-treated and odor absorbing Ideal substrate for tropical plants