I have had 5 pair of various FL wool underwear. I wore a hole in all of them with minimal hiking. I sent them back to FL and they replaced them. Shortly there after, those also wore holes in the crotch. I have a pair of Smartwool, they have not shown any sign of wear. Now I will only buy Smartwool or non-wool Ex-officio. I love the FL, but they just tear way too quick.