The patented Cresent Rod is the most dramatic change in the shower rod in 50 years. It curves inward at the corners to stop leaks...curves outward at the center, extending inches beyond the rim to add 25% more precious, comforting space. Gives your standard tub the same extra standing/elbow room of the much wider oval tub. The Cresent Rod has clean, elegant lines that radiate a custom look.