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. Size 15" L x 15" W x 6-1/2" H