I keep coming back to the Rab Vapour Lite pants for anything from around 45 degrees or colder. I wear them with just Merino boxers to about-5F and with micro weight Merino long johns for anything below.
I have tried Sitka, First Lite sand a bunch of different soft shells and they all pale compared to the Rab's.
They breath great, block the wind and I can be in snow all day without getting wet.
