Utilizing advanced yarn technology, I/O Bio has created the absolute softest merino wool. In the market for next-to-skin comfort, lasting wear and superior washability? Start with I/O Bio. Their merino wool absorbs 30% of its weight in water, provides excellent thermal control and is an annually renewable, recyclable and biodegradable fiber. Why I/O Bio? Because they look out for you and the environment. I/O Bio wants you to explore, work, and relax in ultimate comfort, that's why they make superior clothing crafted with nature's best material ... Learn more about I/O Bio Merino, merino wool. Oh, and I/O Bio has you covered in the style department to, with amazingly soft and modernly designed merino wool apparel that will effortless move from one pursuit to the next. ... Less
I/O Bio Merino
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Average I/O Bio Merino Review 

(based on 156 reviews)
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  • Reviewed by Sarah from Montana on Tuesday, May 07, 2013
    I like this shirt a lot and have worn it several times in just a few weeks. The fit is flattering. I am 5'9" and the length is long enough as well. I got the large. I would recommend, especially for merino at this price.
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  • Reviewed by mhiker from Boulder, CO on Tuesday, April 30, 2013
    This shirt feels like a well worn cotton shirt - very soft. wish it were just a little thicker, though. Great next-to-the-skin base layer.
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  • Reviewed by Skye from CA on Tuesday, April 09, 2013
    Very nice shirt, especially for the price. Runs a full size big, though. I wear a M or L depending on the cut, got a L because there weren't any Ms available, and it fit like an XL. This was easily rectified by throwing it in the dryer once, and now it's one of my favorite shirts.
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