[Virtue Aesthetics]

seems like it would be pretty ideal. I have cotton undershirts that sometimes leave my back feeling cool from sweat, which is actually kind of nice in the summer, but not so desirable in the winter

 

[Flanderian]

Many, if not most people find any sheep's wool directly on their torso intolerably itchy. I know I do.

Though once-upon-a-time it was used for underwear and swimwear! Obviously made of sterner stuff than me. Haven't seen any for sale in my lifetime, though I buy and find wool socks entirely comfortable.

 

[August West]

I have base layers for cold weather hiking and skiing that are merino wool. Incredibly warm, not bulky, and odor resistant. I don't find them itchy at all.

Personally, I think I'd run very warm with a merino wool undershirt, if it was going to be worn inside for any length of time. It would also make for a relatively expensive undershirt.

 

[eagle2250]

They used to do that....we learned our lesson....100% cotton rules!

 

[David J. Cooper]

https://www.icebreaker.com/en-ca/mens-baselayers

https://www.patagonia.com/merino-wool-baselayer.html

https://www.mec.ca/en/explore/how-to-choose-base-layers

I used the Patagonia stuff when I back country skied. It worked great. Not at all uncomfortable.

As an avid sailer and skier when I was younger, I have to tell you cotton is not very useful at all. It gets wet and won't dry, next to your skin is actually dangerous in extreme conditions.

 

[Mr. B. Scott Robinson]

I agree with AW above.

I wear icebreaker brand when in the field on a cold day, and they are excellent, but they are far too expensive and a bit warmish for daily wear.

cheers,

BSR

 

[Color 8]

I wear SmartWool base layers all the time for outdoor activities. They make several weights, light - midweight - heavy, as well as s/s and l/s.

I wear a silk undershirt under dress clothes if I'll be outdoors for an extended period of time, sometimes with silk long-johns if needed. Thin, lightweight, very warm.

 

[sisco]

Woollys brand sells merino v necks. They are the most comfortable undershirts that I have owned.

 

[SG_67]

Smartwool and Icebreaker Merino.

 

[Virtue Aesthetics]

I wear SmartWool base layers all the time for outdoor activities. They make several weights, light - midweight - heavy, as well as s/s and l/s.

I wear a silk undershirt under dress clothes if I'll be outdoors for an extended period of time, sometimes with silk long-johns if needed. Thin, lightweight, very warm.

interesting! I did not realize silk is warm

 

[SG_67]

interesting! I did not realize silk is warm

warm enough to create an environment where a worm can metamorphosize into a butterfly.

 

[ran23]

I once had a bamboo undershirt that was really warm, no summer wear. What to look into that again.

 

[Danny]

O'Connell's sells these Ramblers Way wool undergarments. This about as close to what the OP asked for as I can think of.

https://oconnellsclothing.com/short...by-ramblers-way-natural-209r-rambouillet.html

Myself, if I were worried about moisture I'd wear a wicking polyester t shirt, an activewear fabric.

 

[iam.mike]

If you're in search of an undershirt to keep you warm, and open to wearing a wool alternative that is less expensive, undershirts made with acrylic fibers/yarn would be something to consider.

They are thin, incredibly warm, breath well, and as a bonus, they are not itchy like wool.

The most popular brand carrying this type of undershirt is Uniqlo -- the Heattech line.

The other is 32 Degrees.

Heattech is available in short sleeve and long sleeve. They also offer a long-john bottom made from the same material.

My wife and I wore Heattech and 32 Degrees when we visited Svalbard to visit the Global Seed Vault.

The only downside is that it's a synthetic material, so it holds odor moreso than other fabrics.

 

[Mr. B. Scott Robinson]

Merino wool does not promote bacteria growth that causes odor. One can wear it multiple time in the field without a wash.

I will be sporting Icebreaker in the field today! It is super warm but does not overheat when the temp goes above 50F.

Cheers,

BSR

 

[Guest]

Many, if not most people find any sheep's wool directly on their torso intolerably itchy. I know I do.

Though once-upon-a-time it was used for underwear and swimwear! Obviously made of sterner stuff than me. Haven't seen any for sale in my lifetime, though I buy and find wool socks entirely comfortable.

Have you ever felt merino wool? It is like silk. I will never wear cotton undershirts again.

 

[Flanderian]

Have you ever felt merino wool? It is like silk. I will never wear cotton undershirts again.

Most definitely very fine wool, but I don't know I've ever heard compared to silk. Glad you enjoy it for your undies however. I confine it my hose. The only wool I can tolerate against skin on my torso is cashmere.