best base layer I've ever owned

By backcountry reviewer - Tony Ranked #1018 - Men's Midweight Long Underwear - Tops April 24, 2003

The second I put this on for the first time I knew it was going to be not only my favorite base layer, but one of my favorite shirts period. The Regulator is super comfy and does exactly what it says, regulates your temperature. It's like wearing a climate control system on your body. It's warm, it's cool, it's both.

View Details: Patagonia R.5 Regulator Top - Mens - DO NOT USE

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