Any experience with Golite Crestone Pants

I'll bet the GoLite pants would keep you warm while trekking at 0 F. with just a pair of 200 weight Polartec fleece insulating pants under them, and no base layer longies.

With GoLite out of business now, it's a bit of a moot point sadly. I picked up a pair of the pants for myself and a jacket for my wife when the inventory was being liquidated. I've worn them snowshoeing with and without a fully laden pulk a few times this winter, in temps ranging from 10-30F. They were definitely a bit toasty on the upper end of the temperature range, but comfortable below 20F without base layers. I added cap 2 pants at 10F and they were excellent. My only disappointment is the lack of a hook for a shoe / boot lace on the integrated gaiter, but I think these were designed primarily for skiers and snowboarders. I've had some snow inside the gaiter when I post-holed wearing trail runners.