The Moss Cave is the ideal substrate replacement that will help to provide humidity within your reptiles enclosures. The Cave is lightweight so it can be moved around within your reptiles terrarium or vivarium from time to time. The Cave is perfect for giving your reptiles a feel of the outdoors. Moss is a substrate to aid with reptiles shedding skin and helping to create that natural environment for your reptile. The Cave is also perfect for giving your reptiles a place to hide or rest, or simply just to give them a place to feel safe and secure.