Cocoon UL 60 pants

I do. They're choice. Very warm and comfortable. I found the earlier generation to be sized large but I think this has now been addressed.

>Does anyone have any experience with the subject pants

I have a pair (size XL: 8.2 oz) and they are very lofty and warm for the weight. I sized up to fit over my other layers. They aren't full zip, but that doesn't matter to me since I don't wear them on breaks. I put them on in the evening right after I take off my boots, and wear them to bed. I can dry out my base, insulation and shell layers through them.

I'm happy with my pair. I sleep in them and wear them when I arrive at camp as the sun goes down, or while packing up in the morning.

I've not tried to hike in them, and I doubt that would work well. I didn't buy them to hike in though.