If you are looking for a high quality bumper try RetrieverWorx.com
They are a USA company that makes bumpers using medical grade materials (No BPA or phthalates carcinogens found in other brands) without plugs, valves, and seams that crack and leak like other brands. They are the only company that guarantees their bumpers 100%. They make a variety of colors. These bumpers remain pliable even in cold weather yet rigid enough for a great hold. They are UV protected so they wont harden and crack. We love them at Kickin' Brass Retrievers. Give them a try!