The Mat stat is a simple, economic themostat, designed to be used with heat mats to a maximum of 100 watts. One of the best selling thermostats, alongside the Temperature thermostat
In order to sucessfully keep reptiles in captivity you need to provide the correct thermal gradient for the species kept, in order for it to thrive. Without a thermostat you have no control over the thermal gradient within your vivarium which will fluctuate with the ambient temparature, depending on the time of year.
We therfore always recommend the use of thermostats.