U.S. Patent #5,168,577 The PRO 460 Reverse Seam Elbow Sleeve utilizes a new, patented design which eliminates intersecting seams on the inside of the elbow. These seams typically cause skin irritation. By placing one horizontal seam where the elbow naturally bends and the longitudinal seam on the outside of the elbow, the cause of irritation has eliminated. This new design also features a nylon lining (N2) for ease of application and wear comfort. Available in beige or black, N2 only. Please visit our website at http://www.proorthopedic.com/ for size charts and measuring instructions.