The Exo Terra Forest Moss Tropical Terrarium Substrate is real compressed moss grown in tropical Asia. This ecological substrate is ideal for increasing humidity in the terrarium and is totally safe for frogs, salamanders and burrowing or digging animals. The Exo Terra Forest Moss Tropical Terrarium Substrate is extremely absorbent and is recommended in humidifying shelters such as the Exo Terra Snake Cave or Reptile Cave. It is also an ideal egg-laying or incubation medium.