So other than wearing around the house, the first real test was on the Exum ridge of the Grand last week. These pants performed very well. It was cool enough to wear a lightweight knicker long john underneath...and they layered better than I thought. The pants had just enough stretch, but still felt durable and did not snag or catch on any features. The cinching cord at the cuff came in handy when the wind started blowing high on the ridge. They breathed well enough not to overheat on the descent. I thought these would be a strictly summer only pant, but I am sure they will be good into the low 30's. I have a 32/33 waist and the mediums fit best...better than the medium of the gamma hybrid pant which was way too "slim fitting"....