Rubber Half lined Reins - Brown/Silver. Our Rubber Half-Lined Reins are light in the hands and give outstanding grip for all riding styles thanks to their half-leather, half-rubber composition. The LeMieux Rubber Half-Lined Reins are soft and flexible reins with a mild grip in the riders' hands that are suitable for any discipline. They have great traction in both wet and dry circumstances. They also have a nylon inner to keep them from straining.