The very first one-piece long johns valiantly sheltered soldiers during the Civil War, but we’ve set out to achieve a more perfect Union. Instead of thin jersey, we use the very same fabric that’s earned Buck Naked® underwear thousands of 5-star reviews. It’s smooth on skin, stretches when you move, even wicks sweat and fights stink to give you better-than-bare comfort from neck to ankles. Duluth’s exclusive Reach Gussets® and  Crouch Gusset® give it emancipating freedom of movement. Front placket zips all the way down for easy on/off, and the keister flap has smooth zippered closure for quick “back door” access.