Woman Over Board! A throwable personal flotation device is required by the coast guard. These throwable flotation devices are required to give someone who has gone overboard flotation support until they can reenter the vessel. A boat cushion can fulfill the coast guard requirement for a throwable flotation device. Boat Cushions are less expensive than ring buoys and store easier. At Wholesale Marine, we have boat cushions from Kent to fill your throwable flotation device requirement.