Hydrobuilder's Seedling Heat Mat warms the root area of seedling 10-20 degrees above the ambient air temperature, significantly improving the germination process and the success rate of seedlings and cuttings. Warms root area 10 to 20 degrees over ambient temperature Improves the success rate of seedling and cuttings Completely waterproof construction for safe use and easy cleaning Works great with standard trays (10" x 20") Easy to use 18 Watts - 120 Volts 6' power cord
These heat mats are almost twice as thick as the hydrofarm ones.
That means they are more durable and will last much longer.
They also warm more evenly which is very important when propagating or starting seeds.