I am a HUGE fan of Smartwool socks but have been hesitant to branch out into their clothing because of the high price. I don't know why I waited so long because this top is exceptional. The length is perfect - just a tad bit longer than the Patagonia alternatives. The neck zip goes further down for easier removal and more versatility as the collar can fold down in warmer weather. And the icing on the cake is the PERFECT thumb loops. I have been searching for perfect thumb loops for ages and nothing comes close to these. They fit over your hands easily without stretching the arms and are very comfortable. I am 5'8", 120lb and a small fits perfectly.