Mylar is used in indoor gardens to reflect the light back onto the plants. This film can be tacked or taped directly to a flat surface. Both sides are metalized for optimum reflectivity. Mylar maximizes your lighting setup without adding more lamps or additional heat sources. Reflective metalized film makes the most efficient use of your lighting by reflecting light onto your plants. This makes your light effectively work twice for you. The light film unspools easily from a sturdy roll with no sticking or waste. The roll also makes it easy to store. Simply cut what you need to cover windows, walls, and more. You can even place film on tables or floors, then put plants on it and reflect heat up through their pots and other containers. This reflective metalized film is the best reflective material made. Experience its mirror-like efficiency for yourself!