I was looking at getting some heavy wool pants and jacket and have an option between 100% wool and 85%wool/15%nylon. The 85% wool blend is obviously cheaper to make and does add to the durability of the product. But I was wondering if any of you think the extra 15% of wool really makes a noticable difference in terms of warmth? I know a lot of warmth comes from the "loft" factor, so I'm thinking the difference in warmth would be marginal at best. But I don't have any experience with wool products, 100% wool or 85% blends. Any suggestions?