Fly opening is 1in smaller than my other two armachilo sleep pants I now own three pair BUT the charcoal pair are not the same I might add I own 5 pair of the dang soft sleep pants and I have no issue on fly opening
Men's Armachillo Cooling Sleep Pants
Hot-blooded sleepers know the struggle is real – waking up night after night sweltering, bathed in sweat and tangled in soggy sheets. Now you can chill the heck out thanks to the same cool-to-the-touch technology that’s earned our Armachillo® Underwear thousands of 5-star ratings. Microscopic jade embedded in these PJ Pants actually lowers skin temperature, while the 92% polyester/8% spandex knit fabric wicks away moisture and fights odor. Lightweight and stretchy, these pants never bind or chafe while you’re sawing logs. They’re the stuff dreams are made of!
- Made-in-the Jade™ technology lets you be a totally chill dude – literally feels cool to the touch!
- 4.4-oz. 92% polyester/8% spandex knit wicks moisture, dries quick
- Non-binding elasticized waistband
- Functional button fly for nighttime nature breaks
- Tapered legs with cuffs won’t ride up or twist
- Odor-fighting finish squelches stink
- Rise and shine with UPF 40 sun protection
- 2 pockets
- Imported
Size
I want to compliment a previous review by Jimmy D and add to it. First of all, yes they do run LARGE, and by large I mean maybe 2 sizes. I normally wear a 2x but with some Chinese brands have ordered a 3x and even that was too tight. Luckily I was able to try these on at my local Duluth Trading and went into the changing room with a 3x and 2x. I tried the 3x first and it was way too loose and baggy, legs waist butt etc. Next, I tried the 2x and while it might have been OK with nothing in the pocket with my cell phone(which fit ok, not overly deep but my whole iPhone 12 with Otterbox case fit entirely in the pocket) the weight pulled the pants down, not over my waist but lower than I'd like. I then tried on a XL and it still had plenty of elastic left in the waist and didn't feel like it would fall over my waist with the cell phone and fit just fine in the legs. I got the 32" length(what I wear in jeans) and while they were a tad on the long side, with the elastic cuff, I didn't find myself stepping on the hem, like if you get pants that are too long. I have also tried many base layer pants/sleep pants that were like floods that I didn't like, these had a nice length and kept my ankles covered as I like. The fabric is cool, great for sleep pants and even the fly has a nice button, first time I've seen that! I personally don't like a fly in underwear, I just pull them down but some reviews I've read complain about longjohns not having a "pee hole" so these are the best of both worlds. For people like me, just leave them buttoned and you won't have anything peeping out, for those that like such a hole, you've got one. All in all, they are just what I wanted, my only complaint is the somewhat high price so I won't be changing them every day but truthfully while these were currently fifty dollars, brands like P*tagonia and other top names are sixty and up and I've even seen some over one hundred dollars, which is crazy in my mind but people must buy them......
I love the material and feel of these pants. They are comfortable to lounge around in which is what I bought them for. Two modifications would make them perfect: 1. A premium draw string at the waist. 2. Deeper pockets. The elastic at the waist is good but if you add an iPhone to the pocket it tends to pull it down, hence, a good draw string at the waist would be wonderful. None of those thin strings. Please use a wider, premium string. When I put my iPhone, regular size, in the pocket it barely fits and has a tendency to fall out. Making the pockets deep enough to securely hold a regular size iPhone would be perfect.
Gave these to three of my daughter's boys! They loved them! They put them on and left them on the whole day of our Christmas celebration!

These pants are the best for sizing and comfort.. I purchased the first set and after the first night ordered another set.