Smartwool Merino 250 Baselayer Pattern Crew - Men's

Layer up.

When you're post-holing up the side of a mountain on your way to an alpine yurt, you need a quality technical baselayer like the SmartWool Midweight Pattern Crew between your skin and everything else. This merino long underwear top helps your body stay cool when you're working up a sweat, and it keeps out the cold when you're flying down the mountain. Flatlock seams prevent irritation, shoulder panels let you move freely, and UPF 50+ sun protection keeps your skin safe if you're not wearing a shell.

  • Technical wool baselayer for alpine adventures
  • Merino wool is naturally antimicrobial keeping you fresh
  • Merino wool is incredibly warm yet breathable
  • Shoulder panels give a seamless feel for comfortable layering
  • Slim fit layers underneath jackets well
  • Reviews
  • Q & A
Unanswered Question

Can the Smartwool 250 Merino wool clothing series be worn by itself indoors esp. to bed?
Many reviews state that it's great when worn outdoors with 'activity' but No mentioned if it can be worn by itself in COLD, WINTRY temperatures (30-40F) indoors esp. if one wants to wear it to bed by itself or underneath something like flannel/fleece sleepwear. Thanks!


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

The best layer ever for all things cold. It is so comfortable and warm. It looks great as well, you can wear it from the bars to the peaks and not regret it for a second. This never comes off in the winter and thanks to the marino wool the stink stays out. I recommend buying one for every day of the week. I bought a large for a longer more casual fit. The medium would be a great technical fit but I like to wear this around the town.

The Best

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

My boyfriend and I both wear this as staples of fall, winter, and spring. Soft, cozy, warm. Technical for skiing, fishing, hiking, camping, but also looks good at the bar or dinner with parents. One of my favs. I love wearing it oversized when kicking it outside in the evening after a swim in the river.

Favorite baselayer yet

  • Familiarity: I gave it as a gift but have feedback to share
  • Fit: True to size

Bought another one of these tops for my boyfriend after his got shredded by ski patrol. He was really disappointed to lose his last one because he wears one of these almost every day in cold weather. From work to the slopes he stays warm and comfortable in this shirt.
In short: warm, soft, no chafe seams, best base layer top for cold weather

Great Baselayer

  • Familiarity: I've used it once or twice and have initial impressions
  • Fit: True to size

I am a fan of using merino wool as a next-to-skin baselayer. I have a pair of Patagonia's thermal weight merino base layers as well, and this is a comparable product.

It is soft enough for next to skin, but barely. I love most of the qualities of merino wool, but it is still not nearly as soft as synthetic. I am sure it will get softer with wear, but I could feel a slight itch all over my upper body during the first wear.

I wish it was a little snugger fitting in the midsection.

Overall, it is a high quality product. I am looking forward to having it keep me warm during our sometimes brutal Wisconsin winters.

Good base layer

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

Good solid base layer. Comfortable and not itchy. Wore skiing; not too hot; excellent for layering.