I can tell you that you can not beat "polar tec" as far as warmth. And then there is the windpro brand that cuts the wind as well as any thing.Weight to warmth ratio you simply can't beat it unless you go total down, which by the way packs much better than polar-tec and there lies the problem with he polar-tec. It just doesn't pack down as small as we would like it to, as to not take up an unreasonable amount of space in our packs. I use a lot of polar-tec fleece, most of which I carry on the outside of my pack in a water proof "roll" similar to a sleeping pad and it always satisfies what ever need I put it through...sabre11004...