This Thinsulate ™ 200 grams is an insulating fabric that goes up to -40 degrees Celsius, perfect for winter coats during sports or outdoor activities. Composed of very fine synthetic fibers that are organized as in a dive (between two layers of breathable fabric), this thin and lightweight, but effectively warm fabric, allows body moisture to circulate. Easy to sew, this fabric will allow you to stay both dry and warm. It's the ideal fabric to sew very warm winter coats, high performance sleeping bags as well as for doubling boots requiring maximum heat.