Customer Reviews Smartwool Merino 250 Base Layer Crew

I just ordered my 3rd piece. So comfortable for daily wear

Always been a cotton or cotton-poly blend Henley under-layer wearer til now. This changed everything. Significantly warmer than cotton. Didn't get hot and sweaty while shoveling and cold and damp afterwards. Definitely wicks moisture better than cotton or cotton-poly blends. If this holds up to wear and washing I'll be buying several more in the future.

I use these under layers for skiing. Perfect fit and they keep me comfortably warm.

It's warm when you are outside but you don't get too hot indoors.

Great top with a great fit, it's not too baggy not too tight, I'm wearing right now can be worn by itself or with a short sleeve on top

Love the soft feel and sustainable nature of natural fibers. Bought it for a trip to Europe in the damp, cold winter. It lived up to expectations.

I work as a tree climber in all weather conditions on the rainy side of Oregon and Washington. I use this and other merino wool layers to prevent hypothermia on wet days.

I own a few pairs of smartwool, tops and bottoms this particular shirt is as good as the rest

I normally use this product when I go skiing. However, I recently used it while I was exercising on a cold day. I believe it is the perfect base layer for any activity especially on a cold day. It works so well at keeping my body warm and wicking the sweat. I also use the bottoms in conjunction with the top. The only recommendation i have for Smartwool is to offer more colors. I like the purple or plum color in this top. I would love to see this color offered in more tops and bottoms. Another recommendation is for Smartwool to offer a way for customers to vote on their website on which colors customers would like to see more of.

Warm base layer! Perfect for cold days outside. I have several of these! Very durable

Got this great shirt in the beautiful Nival Blue for my husband, who only recently began to appreciate the many benefits of merino wool. Now that he's hooked, we're glad I found this one! It's soft, temperature regulating, high quality, and flattering, as well as being versatile and smell resistant. YAY!

Smartwool thermals aren't just another base layerthey're the benchmark I now measure all cold-weather clothing against. From the moment you slip them on, it's clear these aren't ordinary thermals. The Merino wool is incredibly soft (zero itch), remarkably breathable, and almost magically able to regulate temperature. Whether I'm skiing, hiking in sub-freezing wind, or just walking the dog on frosty mornings, they keep me perfectly warm without ever overheating. What truly sets Smartwool apart is the balance of comfort, performance, and durability. The fabric stretches naturally with movement, never bunches, and holds its shape even after repeated washes. Odor resistance is another game-changerI've worn them for multiple long days on a winter road trip, and they still felt (and smelled) fresh. The fit is athletic but forgiving: snug enough to trap heat, yet flexible enough for layering or high-output activities. Seams are thoughtfully placed to avoid rubbing, and the overall feel is light, almost like a second skin. Yes, Smartwool thermals are an investment, but they outperform cheaper synthetics by a mile. They last longer, feel better, and make cold-weather adventures far more enjoyable. If you're serious about staying warm and comfortable, these are absolutely worth every penny. Bottom line: Exceptional warmth. Exceptional comfort. Exceptional quality. Smartwool didn't just make a thermalthey perfected it.

I haven't had a proper pair of thermal base layers in 15+ years... I'm so glad my partner turned me onto Smartwool because this top is amazing... and fits perfectly! (I'm thin and 6' and the "S" fits me perfectly.) Totally endorse this piece of kit!

I haven't had a proper pair of thermal base layers in 15+ years... I'm so glad my partner turned me onto Smartwool because these bottoms are amazing... and fit perfectly! (I'm thin and 6' and the "S" fits me perfectly.) Totally endorse this piece of kit!

This can be used as both a base layer and as a shirt! Love it!

An old man who still runs trails year-round. I absolutely love the Classic Thermal's cut (fit), too!

This is a great layering piece and is great on it's own. My husband owns it in several colors.

This shirt saved my last trip to New York! The base layer is stylish enough that can be used as the main shirt and it protects you really well from the elements! It's also great to use while inside an airplane. Not too hot, not cold at all just right!

Enjoy wearing the base layer all day long and didn't even need to take it off.

Use my smartwool baselayer hunting and ice fishing in Mainelove 'em! Wouldn't buy anything else

I've used this for cycling and it performs well. It's warm, yet breathable. Note that the body length of the shirt is on the longer side.

Office is cold, I wear my thermal under dress shirts for a more comfortable day.

This was given to me as a gift and I love it. Can be work casual or dress it up

Everyday use

love it other than the label on the inside. sewn in and hard to remove.