I found myself free on Friday night, so I packed up and headed out to the northern end of the Clwydian hills, which are the closest hills to me at the moment. I wanted a night out, and to try my new Thermarest Uberlite for the first time. The forecast was relatively clear and breezy, so I wasn't expecting to push the mat's boundaries. The first surprise of trip came when the Zpacks pole extender broke in the moderate breeze. No real problem, I just pulled the Altaplex closer to the ground with the shorter pile length. With the slight angle of the pitch though, I did wake up a couple of times in the night with my face pressed against the midge netting. I was comfortable all night and only woke up because of the previously mentioned angle of the pitch. I was surprised to wake in the morning to a heavy frost though. If I'd known that it was going to be that cold, I would probably have taken a mat with a higher R value. The mat proved to be adequate for the conditions though. It didn't feel warm, but I didn't feel as though my body warmth was being sucked out of me either. I'm quite a warm sleeper, and I'm now confident to use it on frosty nights, just as long as the ground isn't frozen when I pitch camp. I think that would push it beyond it's limits.