Meet the Water Leg from Standard Cyborg: a duplicate prosthetic leg that you can take to the beach or the pool. Since walking legs are expensive and not designed to go near the water, you could save yourself a lot of trouble by getting a water leg. It is 3D printed to fit you perfectly and made with composites that are used in aircraft manufacturing to offer durable and reliability.
The Water Leg is 100% waterproof in fresh or salt water. It works with the suspension sleeve you already have. These guys work with your prosthetist and 3D print your leg using aerospace grade carbon fiber. You just have to pay $499 to get started. What do you think? Are you impressed?