Over the years we have developed a variety of products to help a customer enhance their EZ Pool ownership. In fact, we provide more customizable accessories than all other portable pool retailers combined. In the case of Mark Beck, rather than go with our RimGard® attachment product, he elected to go with a built-in RimGard. The advantage of the built-in RimGard is you get a cool-to-touch rim area around the top of the pool. Imagine if you had a dark colored pool. Whenever you go to lean on the side on a hot day, you would sear your skin from the hot rim. Adding the white rim at the top prevents that. It also makes it easier to clean as well.