Designed to protect your boat and stay in place while rafting together. Extensively on water tested. Features 6 molded in lateral tubes for superior crush resistance, exclusive channel design to prevent pop out and assure positive locking action along boats rub rails and 2 integral lengthwise tubes to allow more cushions to be tied together for a soft rafting board. Hangs vertically or horizontally. Ideal for tying to piling. Comfortable for sitting. Height allows view over windshield. never to be used as a life saving device.