Fleece

Did you know that the inspiration for fleece were polar bears? The fabric was supposed to resemble fur, be lightweight, durable and very warm. This goal was achieved in 1979.
Nowadays there are different types of fleece available for purchase, differing in grammage among other things. Thick fleeces (high grammage) are windproof and ideal as outerwear, while thinner ones are better for use as one of the layers of clothing.