The magic range is a new, unique, innovative concept from Putnams. The range is self-inflating simply by opening the valve, the foam core automatically expands by sucking in air. With the valve open, press the product until the desired size and comfort is obtained, then close the valve. Idea for car, plane, coach and train, a travel must have to avoid aches and pains. Lightweight, waterproof and covered in hardwearing cotton, they are completely adjustable, very supportive and because they have a foam core they are very stable.