I've got an REI jacket that's pretty similar to that Shower's Pass jacket. Below 35 degrees I need a thermal shirt as a base layer. Above 45 degrees and I start to get sweaty with just a thin polyester shirt under it. Then again, I start to sweat pretty quickly when I get into the aerobic range. There's nothing I could wear that would get me to work in a dress shirt that was still presentable. I just change (into T-shirt and jeans) when I get to the office. As has been said before, layering is pretty key. Arm pit zippers are also important.