My biggest concern in searching for new thermal underwear was something I could use daily and that wouldn't be noticeable. The typical "waffle" style long underwear would make my jeans bunch up, and forget wearing dress pants with those. Well, I was very excited to see that these were very form-fitting, but not in a constricting way. The best part was I could use jeans with no issues, and dress pants for work with no bunching. They're comfortable enough to wear all day and keep me warm enough on a walk on a cold day. I highly recommend these and found the sizing chart to be spot on. I liked them so much, I ended up getting five of varying colors.