Re-engineered for better performance and greater durability. The new, stronger heating wire and thicker multi-layer construction offer more uniform heating and the durability to withstand rugged greenhouse environments. Seedling heat mats offer versatility and portability for all your horticultural needs. The durable double-layer construction is waterproof and makes them ideal for greenhouses, nurseries and hydroponic hobby gardens in need of maintaining a specific root zone temperature for valuable crops.