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I/O Bio Signature Track Jacket: Base Layer Reviews

I/O Bio Signature Track Jacket: Base Layer Reviews

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I/O Bio Signature Track Jacket: Base Layer Reviews

New perk: Easily find new routes and hidden gems, upcoming running events, and more near you. Your weekly Local Running Newsletter has everything you need to lace up! .

After testing half a dozen merino-wool midlayers last winter, this was the one we reached for most often, whether we were going skiing or to the bar. A high collar helps seal out the cold.
TAGS: merino wool, shoulder patch

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