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Merino 150 Baselayer - Men's

4 out of 5 stars
3 Reviews

Out of Stock

Don't worry though, we have a lot more Men's Lightweight Long Underwear Tops in stock than that.

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Why We Like the Merino 150 Baselayer

From wearing it under your favorite fleece to wearing it solo, the Smartwool Merino Men's 150 Baselayer is ready for all your activities. Its merino fabric is blended with nylon so you still get the soft merino feel and wicking properties, but with added durability to hold up to the day to day. The raglan sleeves offer great mobility and comfortable layering, while the flatlock seams prevent chafing.


  • Lightweight shirt for layering or wearing alone
  • Merino blend fabric regulates temp and fights odors
  • Raglan sleeve design eliminates shoulder seams
  • Flatlock seams eliminate chafing during long wears
  • Slim fit works well with layers
  • Item #SWLZ8EP
87% merino wool, 13% nylon
Insulation Weight
Center Back Length
[medium] 28in
Claimed Weight
Manufacturer Warranty
2 year

Overall Rating

4 based on 3 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large


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5 out of 5 stars

March 10, 2023

Great quality base layer

I've put it through the wringer

I felt compelled to write a review based on all the mixed reviews on this shirt. I didn't find this to be scratchy at all, it's 88% wool/12% Nylon and it felt soft to me. I ordered an XL for just a casual undershirt base layer and the fit was perfect. Just like any review on any product people have their own options on comfort so just order it if you're already looking for a wool base layer and decide for yourself but the quality is top notch as expected from smart wool.

fred_chitt1266910 f

Originally reviewed on Backcountry.com

5 out of 5 stars

February 21, 2023

Perfect lightweight t

Love these mostly wool shirts - I avoid Smartwool's blends. For full out efforts I use poly, but for everything else this is my go to.

david546303 d

Originally reviewed on Backcountry.com

2 out of 5 stars

August 2, 2021

A little hot and a little scratchy

I've used it once or twice and have initial impressions

This is my first merino shirt. I bought this to wear on hot days because I read that is is superior to synthetics for odor. Unfortunately it?s much warmer than my synthetic shirt and heavier. Also it is definitely not as soft. In fact it?s a little bit scratchy. I have merino sweaters that I have worn without a shirt underneath and they were much softer. This is just an initial impression and I have not yet gone hiking with it.

Chris K

Originally reviewed on Backcountry.com