The Hell are you doing with them? My pairs last me eons before I need to buy another pack.
They last me half a year before they are all stretched out and have holes in them and then I buy more.
Running, sleeping, farting.
I mean they aren't great quality. And not all of them get fucked up, but I like to re-up every 6 months or so just to have brand new Underwear. I hate wearing old, nasty drawls.