The Exo Terra Rain Forest is a 100% natural, biogradable 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 is maximised by adding natural sphagnum moss to the mixture. Adequate air humidity levels aid in shedding and help prevent respiratory infections