Boost plant growth with the Apollo Horticulture Seedling Heat Mat: warms root area 10 to 20ºF above room temperature to improve root growth and increase germination rate. Heavy duty: made of durable waterproof material to ensure a safe grow environment. Constructed using reliable materials held together by enhanced internal wiring. You can always rest assured that you are backed by quality hydroponics equipment from Apollo Horticulture. Designed for indoor gardening: enhances seed germination process and increases success of seedlings and cuttings.