I just received my Alpinist Half Zip so this will be on fit. I'm 5'10" 160lbs. 15 1/2" neck.
First, like another reviewer stated the pocket is small. I can barely fit my Kyocera Brigadier phone, so I will be using it for snacks and power gels for hiking.
The arm length, covers my knuckles perfectly when using the thumb holes.
Good fit around neck.
Took my dog for a 10 minute walk with t-shirt underneath it is 38 degrees with 7-10 mph wind, I felt the cold on my arms after a few minutes. I think it will be good in moderate winter weather with a medium weight t-shirt for hiking ascents in the tree line. Update after I use it.
This review was written in the old system and had content requirements that are different than reviews written today.