WL Gore, a specialist in membrane technology, is launching a new waistcoat made from extremely thin GORE-TEX two-layer laminate that contains inflatable air chambers. The Air Vest's air chambers, which can be integrated with zips, buttons or Velcro into ladies' or men's jackets, are easily adjustable. When the wearer feels cold, he can increase the volume with a valve and then let it out again when the temperature heats up.