nice to have
These are light and pack away small in your pack. I have always carried them as insurance on cold (sub 40s) hikes. Finally used them for a few rain/sleet/snow cold days on the Colorado trail worn over silkweights and I gotta say I am very impressed with the breathability. No moisture build up. Now it was cold and lower humidity but they worked as adv. Front zip pocket was handy for keeping the digital camera against my leg and warm enough to function. My only gripe is the elastic pull for the waist. It didn't fail but looks suspect. If it did it would not be a show stopper, merely an inconvenience.