I am  59, 150 pounds, and the 3X size  fits me like a very comfortable glove. I am 60 years old and didn't think  I never get another compliment about how great I look in jeans! I could sleep in these, and have done so on airplanes. Too hot in the summer, but great the rest of the year. Just make sure you plan to wear a long shirt, because the pockets look ridiculous.