Leisesturm I did spend some consideration between the 2 different series. In the end I decided that the retroreflective pattern embedded within the garmet and the heavier gauge of fabric to be the deciding factors in favor of the Urbanaut. 800 grams versus 200 grams. Let me know how the billowing sail action goes. I'd like to offer one of the lighter ones as a gift & at $100 the price is definitely right if it performs well. Keep me posted