Crown moulding frames and ornaments the ceiling, and it gives the interior space a refined and polished appearance. It also compliments door and window casings. And the possibilities don't stop there. Crown moulding ornaments cabinets, recessed shelves, furniture and more. Flat trim with cove moulding is crafted in durable urethane, a lightweight but dense and durable decorative polymer material that captures the classic beauty and character of traditional moulding. Urethane moulding is moisture resistant and primed when crafted. Cove moulding derives its name from a concave shape. Cove moulding is a popular crown moulding profile because this concave shape creates a visually pleasing tradition between wall and ceiling.