This product works. I wore it every day of a 7 day trip into the frank church. A good thermal top a t-shirt
and this vest was perfect for just about every situation. It will keep you warm even if it's soaked through with sweat, and dries out quickly. It's very easy to wear, as in its not bulky. Overall really happy with this vest. I ate a Colorado elk tag last year and a Idaho elk tag earlier this year, and behold I got my first elk within a couple hours of the house. 2.6 miles with a 3k Elevation gain. Thermal, regular shirt and this vest. Really good combination of warmth and comfort without having to take off and put on layers. It was mid 20's to high 30"s. The only adjustment I made was putting on and taking off a stocking hat.