What are you guys doing to the First Lite Underwear that durability is an issue? I've wore mine for weeks at a time all over the world and they are still going strong. I have both some of the original "long" ones and some of the newer style. I've wore them for weeks at a time on goat hunts, sheep hunts and wear them all winter coyote hunting. I usually take two pair on a 10 day hunt and wear each pair for 5 days. No stink, no durability issues what-so-ever. I've never tried any other wool undies as I've never had reason to. I buy mine a size big, cause I don't like the boyz restricted...Maybe you all are buying your drawers too tight?
Same here I have worn the chit out of mine hunting with no issues and I wear them daily too. I have a few pairs of Sitka merino briefs and I think two of the three have holes in them now and are coming apart at the stitching. Just my experience with those two brands.