I originally assumed 100% merino was clearly the way to go too, it really isn't very durable though...I have a 1 year old 100% merino shirt that's almost more hole than shirt at this point. On the flipside lots of companies are cashing in on the word merino, take a close look at what percentage of the fabric is actually wool though. I bought a "merino" shirt at costco recently without reading the fine print...a whopping 11% merino, it stinks after a lackadaisical day at the office lol. A high percentage merino blend is your best bet, I don't have any personal experience with the FL merino but plan on switching over for this season, icebreaker isn't bad but I find it a bit itchy.
Edit: since posting this I've fully transitioned to FL base layers and won't look back, the difference in quality/functionality is fairly significant in my opinion.
Edit: since posting this I've fully transitioned to FL base layers and won't look back, the difference in quality/functionality is fairly significant in my opinion.
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