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When you start a long hike in the early-morning chill but you know you'll be coming down the mountain under a hot afternoon sun, wear the Patagonia Men's Merino 2 Lightweight Crew. This long-sleeve baselayer regulates your body temperature—it warms you in the morning and helps keep you cool in the afternoon. It's soft to the touch and doesn't bulk up when you put your backpack on, and it stays dry so you don't have funky sweat stains from your pack.

  • Merino wool is soft to the touch, breathes freely, regulates body temperature, and naturally controls odor while polyester wicks moisture and is extremely durable
  • Slim fit allows you to slide layers over this easily without have to readjust clothes afterward
  • Side seams prevent bulking and uncomfortable rubbing and chafing
  • Raglan sleeves eliminates irritation when worn with a backpack
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Great Base Layer

  • Familiarity:I've used it several times
  • Fit:True to size
  • Size Bought: Medium

Very comfortable. Slim fit perfect for my size. Used successfully for camping / long hikes several times. Dries quickly with minimal odor. Initially uneasy for not being 100% merino but haven't noticed issues yet.

Best in wet weather

  • Familiarity:I've put it through the wringer
  • Fit:True to size

I have a 10 different sets of base layers from Patagonia, both in Capilene and Merino, and love them each for different reasons. While the Capilene has a nice soft feel and good warmth, the Merino is what I pack when going flyfishing. Overall, it is lighter for the same warmth value and doesn't turn into a slow-to-dry, clingy, rubber-feeling wetsuit like Capilene does (and all other brand synthetic base layers) if I slip and get dunked while wading. I prefer sleeping in Capilene for some reason, but for doing anything where I could end up soaked, I use the Merino.