Anyone that spends any time outdoors has heard of Polar fleece (or sometimes it’s just referred to as fleece). Polar Fleece is a soft insulating fabric made from Polyethylene terephthalate or PET. Wikipedia tells us that “PET is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers; beverage, food and other liquid containers.” The synthetic fibers are used to create an extremely lightweight fabric that is intended to be superior to the insulating properties of wool. Fleece is warm and lightweight, breathable and dries quickly. The key to keeping warm in cold weather is insulation and believe it or not, air is a great insulator. The fabric is made up of many lofted synthetic fibers that trap air. That air is warmed by the heat given off of your body. The fabric keeps and holds that heated air heat next to you, which in turn, keeps you warm. Think of it like a high tech, very thin version of fiberglass insulation… that you can wear. My family and I wear polar fleece pretty much all year long and we each own many different thicknesses or weights of the fabric. We own at least one item of polar fleece everything from hats and socks to pants, jackets and vests. It”s pretty much our household standard. Anyways, as much as I love Polar fleece, I really had no idea how they made it and how it got it’s soft, almost fuzzy texture. I came across this great video that explains how it’s made…on imagine this… the “How it’s Made” show on the Science/Discovery Channel. I hope you find it as interesting as I did and maybe it helps remind us of how much thought and engineering goes into so many of the things we take for granted in our society.