- This ultra-light fleece Sweater Has A super comfortable fit and will keep you warm while traveling. The sweater Is Part of our pack and go! Collection Made for commuters, urban nomads and weekend city hoppers. All products in this innovative capsule collection are ultra-light and packable and ideal for light travel. The jwp sweater is made of lightweight And stretchy NANUK dynamic wool Heather. The back of the fabric has a soft, skin-friendly texture.