Polyester Jackets

If you are wanting to have something lightweight and warm, polyester will do the trick.  While it is not waterproof, it can keep you warm.  But since its not waterproof, you can put an oversize poncho over it and you should be fine.  I like the polyester mostly because of its lightweight-ness so you don't get weighed down like some other warm but heavy coats.  But also polyester is also bulky in a way if you want to pack it in a backpack but it can be squished down if you put it at the bottom of the pack.