Create a moss-covered jungle habitat with the Exo Terra Moss Mat Terrarium Reptile Substrate. Substrate is necessary to the health and well-being of your pet because it absorbs waste， helps control humidity levels and encourages burrowing. The Exo Terra Moss Mat Terrarium Reptile Substrate is an extremely natural-looking terrarium substrate that can be used for all types of reptiles and amphibians. Soft， hygienic and absorbent， it is easy to use and can be cut to fit any terrarium size. Simply rinse clean when soiled or replace as necessary.