The Exo Terra Substrate Heater Mat is an under-tank heating pad ideal for Extra Small to Large terrariums (Depending on the size ordered). This heat mat attaches to the bottom of the tank to provide a warm spot on the substrate. It’s perfect for reptiles, amphibians, or invertebrates that need a gentle heat source, such as tarantulas, hermit crabs, or hatchling snakes. It raises the floor temperature without heating the whole tank, preventing overheating by emitting a mild, safe heat that won’t burn your pet when used correctly. Use it with a thermostat for precise control. The mat is energy-efficient and can operate 24/7 to simulate warm soil or rock in a natural environment, especially useful in cooler rooms or at night when lights are off. Available in Multiple Sizes