When you see and feel the material that the under layers from Grays Harbor Unders it may not appear different from other high-tech materials made to keep you warm and dry while fishing. However, there is nothing else like it. I am sure you have all tried materials that “wick” moisture. All they do is pull the moisture through the fabric. Grays Harbor Unders fabric actually transfers the moister from your skin to the outer layer, keeping you dry and warm. I have been wearing the long-sleeved mock turtle neck top and a bottom layer of tights for three years, and they are simply amazing. It may sound impossible, but if you go to the link that I have included, you can watch a video demonstration and see for yourself: https://www.youtube.com/edit?o=U&video_id=2xHZSy7sOrw. Believe me there is nothing else like it on the market. I strongly encourage you to watch the video and then go to www.ghunders.com, and check out their catalog. There are many great products available from this all-American made and local company.