Just as a featherbed adds the ultimate luxurious touch to a well-appointed bed, the Therm-a-Rest Down Coupler sends your outdoor sleeping experience over the top. This coupler, which is sized to mate any two sleeping pads up to 30 inches wide, is stuffed with 650-fill down for unprecedented comfort and warmth. Perimeter snaps accept Therm-a-Rest down comforters and blankets to top off your best outdoor night ever.