I used this for the first time last week in the Smoky's. Temps were between 40 and 70 while hiking and this shirt did great at keeping me cool and dry on the trail, and warm at camp after a long day. The zipper in front seems like it goes a long way down but i just never opened it all the way up. By the end of the week thre was a smell to it but a quick rinse in the stream and it was back to smelling fresh again! Bottom line, I will continue using this as a base/ only layer and recomend it to everyone I know!