Bought for my son and are true to size.  He says they fit well and are comfortable and not constricting.  They provide sufficient warmth outside, but don't overheat him inside his office and are comfortable enough to forget he's wearing them.  I would speculate that these would be most appropriate in a milder winter climate, or for limited outdoor use in colder climates.  These are great for our fairly mild winters with occasional zero to 15 degree temps.

I bought several pairs of these for my husband last year and he also likes these better than any other types/brands he's tried in the past.  He actually wears these!  They've held up well during these 2 winter seasons.