Product details:

The legendary ThermoBall Jacket has been a mainstay of city slickers, campers, and everyone in between. This versatile jacket uses TNF's tried-and-true ThermoBall insulation, which is a type of synthetic insulation developed by the engineers at PrimaLoft. This material mimics down feathers and traps warm air within millions of tiny pockets; ThermoBall insulation has the same weight and compressibility as down, and works even when wet.