A cushioning device has two materials that are sealed together at their peripheral edges to form first and second sides and first and second ends. Positioned between the first and second materials is a middle material. The middle material has the top and bottom sides, a gap between the first side and the middle material and another gap between the second side and the middle material. In addition, the first material is sealed to the middle material's top side by a first set of interior welds. The second surface is sealed to the middle material's bottom surface by a second set of interior welds. The first set of welds on the middle material's top surface and the second set of welds on the middle material's bottom surface are not superimposed on each other or overlap each other.