Combining a modern high-quality wood look with weather resistance and durability, this raised bed is the perfect for extending your gardening season. The injection molded slats easily join together to form a stable raised bed. The BPA free plastic is 100% recyclable and unlike wood, there is no need for painting and no splintering or rotting! Aluminum braces across the middle prevent the sides from bowing. The Timber Raised Bed Kit with Cover includes a light-duty cold frame cover constructed of 3mm twin-wall polycarbonate to protect tender seedlings and extend your growing season. Add an extension layer, sold separately, for additional height.