Tube (toy)
A swim ring (also known as a swimming ring, swim tube, rubber ring, water donut, floatie, inner tube, or, in the United States, a lifesaver) is a toroid-shaped (hence the name "ring" or "doughnut") inflatable water toy. The swim ring was derived from the inner tube, the inner, enclosed, inflatable part of older vehicle tires. The inner tube, when inflated, was used as a water toy, and as a floating object to lounge on. The swim ring is not designed to save individuals from drowning. Structure A swim ring consists of two identically-sized layers of flat plastic, one of which contains a valve. The shape of each layer is like a large circle with a smaller, concentric circle removed. The two layers are joined at their inner and outer edges, sealing an air chamber inside. Swim rings (also called "swimming rings", "swimrings", "inner tubes", "innertubes", "rubber rings" or "floaty/floaties") are inflated with air and worn around the user's torso, usually just under the arms or sat up ...
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