Winter comes around every year and for much of the country it's just really cold for many months at a time. These thermal pants are somewhat like tights which are generally worn under something else like snow pants, jeans, slacks, or anything else you would normally wear but just aren't warm enough. So far I've worn these under my denim blue jeans while going out to a job site maintaining a professional and normal appearance but also staying warm standing outdoors in cold and windy conditions. They kept me much warmer than regular pants alone, but since the material is breathable I wasn't uncomfortable or sweaty.
They stretch enough to fit most normal leg sizes and shapes, I accidentally got a 2xl and probably would fit a 1xl better, but if you don't like tight material the next size up still feels nice.. After a bit you just forget you're wearing them except you're not cold! There's no tag on the rear so no chance at it causing itchiness, plus the elastic at both ends feels great. I really like these thermals and it's great they come in a pack of 3 for no other reason that you'll need a few pairs of these to keep you warm this winter!