I took a Patagonia Capilene tee on a backpacking trip and it stunk to high hell in a day whereas my LS yak fiber shirt was fine after a full week in it, day and night. All of my synthetic cycling jerseys need washes after every ride and they stink. Not all wool absorbs. I rarely wash my merino wool cycling jerseys, perhaps every 10-15 rides. I almost never wash the alpaca or yak.