Keep any seed or plug trays warm to aid germination & bring on young plants. Perfect if you don't have a greenhouse, a propagator or even an area indoors where you can keep a constant heat. Easy to store too, just roll up when not in use. Turn any flat area into a propagator by plugging in the flexible rubber pad to raise soil temperature by 5-10C. 3 year guarantee. Pad measures 40 x 65cm.