Growerology Waterproof Seedling Heat Mat for Seed Germination, Hydroponics and Plant Propagation - MET Certified Plant Heating Pad for Indoor and Outdoor Home Gardening Seed Starter Kit (10" x 20.75") BETTER, FASTER RESULTS: Seedling Heat Mat for faster seed germination and increased germination success. GROW BIGGER, HEALTHIER PLANTS: Heating mat warms the root area 10F - 20F above grow-room temperature. DURABILITY: 10" x 20.75" MET certified heat mat size with 6ft power cord. Waterproof construction, flexible, durable and easy. MULTI PURPOSE USES: Great for plants, seed starting, kombucha brewing, reptile terrariums and more. BONUS: Comes with insulation piece that can be placed underneath the heat mat to improve heat mat efficiency. Insulation piece prevents heat loss downward and helps reflect heat upwards, towards the plant.