Cushioned rail caps go over the edge of your hard-side wood frame waterbed. They are cushioned with extra thick soy-based foam and quality upholstery material to provide a padded and comfortable sitting edge and easier and more comfortable getting in and out of bed. They are 4” wide and go 1 0.6” down the side of your waterbed. They add comfort and style. The 2 piece set has one for each side of the bed. They are handcrafted.