These are very thin, like a pair of womens panty hose, however, 90% not see thru. They do have a functional fly.

I thought they'd be a little thicker. the mens XL weighs 3.7 oz (for those of you who want to use for backpacking).

They are comfortable but I will use in my sleeping bag.

These also snag easily like panty hose, so a tip to keep the run from getting worse: use clear nail polish where the run is going to continue, this stops it.