This is an old product, but it's a Pro Gwin Winter Compo Vest with PrimaLoft. PrimaLoft was adopted as a substitute for goose down, which was used in military sleeping bags, and was highly praised for its "heat retention," "lightweight," and "water repellency," which down lacks. Nowadays, famous sports brands and outdoor manufacturers around the world are using PrimaLoft instead of high-quality down. <A pocket for a heat pack is on the back.> It can be folded for easy packing. Thank you. Color: Black Size: L