I'm 6'4", 168 lbs, 12.5% bf, 33x36. I have a "Medium" for 30-32 inches, they are loose and baggy. I don't have particularly large hips but if I have small ones they may not pull up all the way. I have a very small butt so if you have one these might fit better but you need a lot. some of they are really weird. The "pouch" is oddly shaped and pointed like a witch's nose. I guess it doesn't matter if you wear them under real pants. Front. Pictures are not exact, these were probably taken with a cup or some sort of padding/shaping.The fabric is thin but feels good.It's definitely underwear.Can't imagine they are warm at all.I'm sending them back, they absolutely don't suit my figure.