I bought these LL Bean wintersport pants for local hiking and cold weather riding. These may not be suitable for 6-hour hikes in rough terrain, though. But they are supremely comfy and warm. I've worn them cycling in 30F temps with no thermals underneath and they've kept my legs warm. They're so comfortable that I'd consider wearing them just sitting around the house, except they're black and we have cats, so that wouldn't work.
https://www.llbean.com/llb/shop/35425