I use a Filson wading jacket but it fits over the top of my vest. Are you using your jacket for a vest? I love me Filson for cold weather but you do sweat pretty bad if your doing a lot of walking when it's warm. That things is really tough material and has lasted alot longer than alot of my other jackets. I tend to rip the Gore-Tex ones.
Just my .02

Crayfin