This is a top-notch running jacket with all kinds of cool technology in its materials, however, I just wear it because I love the feel next to my skin. It is so soft and lightweight, I can forget I even have a jacket on. With most of my other coats I have to remove it when I get in the car because I rapidly get too hot. This jacket stays on so I don't always have to be tugging it on and off every 5 minutes. That is worth it's weight in gold (although I guess it may be too light for that to amount to very much, 5 oz I think). If you don't know, Nebraska's weather can change quickly. In one day we had sun, rain, ice and snow, which cleared and we had sun again. You never know. Good to have a versatile jacket to rely on.