 Whitcomb's tests finally culminated with the first successful test flight of his attached winglets on a KC-135 Stratotanker on July 24, 1979.1979 Polar fleece

Polar fleece, or "fleece", is a soft napped insulating synthetic wool fabric made from polyethylene terephthalate or other synthetic fibers.Found in jackets, hoodies, and casual wear, fleece has some of wool's finest qualities but weighs a fraction of the lightest available woolens.