Just a warning: I bought these in Large based on the "Duofold Men's Long Underwear Sizing Chart" information on Amazon,  L = 38"-40" Waist. However received the package and it says clearly printed on back L = 36" - 38". So there is a 2 inch discrepancy in sizing. I have not tried yet, I'm sure I will like the quality but am debating sending back the unopened package to get the next larger size.