ANLIQI Men's Cotton Thermal Underwear Union Suits Henley Onesies Base Layer (Red, XL)

Nice and warm to wear around the house at night with the thermostat turned down a couple degrees. Really helps by not having any gaps to leak torso heat away like with a traditional two piece sleepwear. The only thing is the opening in the back is pretty pointless. It doesn't line up with you know what even though everything else fits perfectly, it's way too small, and requires two hands to hold open with considerable tension. Had you managed, then taking one hand away to get some paper to wipe and the cloth would snap back and smear requiring immediate laundering. Since this isn't the 40s anymore like in the cartoons where people went outside to a cold outhouse like my grandparents in North Dakota, people don't really need the flap anymore. But it is basically cosmetic and I wouldn't try to use it.