Smartwool  Active Ultralite T-Shirt - Men's

This is a very light and a bit stretchy material, hadn't noticed it wasn't the smartwool 150 shirt and it is only 50% wool but it still feels nice and doesn't stnk so good enough. Wears great on the very hot days. It runs much larger than smartwool 150 shirt size I ordered around 2020, in the photo the gray is this 120 and the 150 is the green on top, both are XL size and no I didn't shrink the 150; most of my clothes are wool and I'm very careful washing them.

These shirts are amazing for hot weather! I've become a huge fan of merino wool clothing over the past few years, and these shirts (I own two of them) give all the benefits of merino while being very lightweight and comfortable to wear in hot weather and when you're working up a sweat. They dry VERY quickly just from body heat and minimal air movement, and though they are a merino / lyocell blend they maintain the traditional "stink resistance" of merino. I wear them when hiking and backpacking in summer heat, and now when I am doing workouts as well because I find them more comfortable than synthetic shirts.

The shirt was great for the two times that I wore it. It developed holes after the first washing and now my $60 tee is unwearable.

Idk where other people are coming from, but this shirt feels buttery soft. I wear it mostly as an under layer for my Pendleton flannels on chilly days, but standalone it has a nice fit not all tight in the armpits and long like most men’s fashion. I’m 5’7” 140 lbs athletic build and the medium fits me well. Does good for hiking/backpacking too. I can wash it in a river and I’m chilling. Lighter colors might be see through slightly. If you want a skin tight under layer choose a different shirt as this has a nice drape to it. I have a touch aversion to synthetics so this shirt comes in clutch.

This is a good workout shirt, not a base layer. As the description says it’s got less wool and is cut looser than the 150 which gives it better airflow. The wool content in the shirt is sufficient to keep the odor manageable. Too early to tell if it will hold up as well as the classic. Bottom line is I’d buy the 120 again for what it’s designed for. For a base layer I’d spend a the extra to get the 150.

This feels incredibly soft next to skin - think silky smooth. I didn't think anything could be lighter than Smartwool 150 and sport 150, but I was wrong! This is by far the lightest weight fabric I have ever worn. I've used it for various outdoor activities and it performs great. The fabric seems like it might not be the most durable so I washed cold and hung it to dry. Only con is the sizing is larger than my other Smartwool apparel. I would recommend ordering a size down unless you like your shirts baggy! Also, since this is a Merino blend, the anti-odor properties aren't as good as higher percentages of wool. #SmartwoolLove @smartwool.

I purchased two shirts (light blue and red) in late August 2024 for a hiking trip to Austria and the Czech Republic. I was pleased with the weight, comfort, and softness of the shirts. However, the fabric is already showing wear and tear (both shirts have fabric runs, with the red shirt having three in the front and the blue shirt having one in the back) and I have only worn them perhaps a dozen times either to hike or to walk on my treadmill. I have several Smartwool base layers and am very pleased with them (no durability issues), so I am very surprised at the lack of durability, especially for what are really brand-new shirts.

Runs a size bigger and neck is too large for my taste. Wouldn't buy again.

The fabric is lightweight so good for warm days or as an underlayer. I ordered a men's medium, while I usually buy ladies large, because I wanted upper arm coverage and the current style for most ladies' T shirts is very abbreviated sleeves. The body is also quite long on me and the shirt overall feels quite roomy, so I'd agree that it runs large. But not enough for me to return it!

I've had this shirt for about a month and have used it for everything. I've used it as a comfortable sleep shirt, an undershirt for work, it has been great at the gym, and I've used it as a running base layer in 20 degrees (F) as well as on its own at 50 degrees. The fit is great, too. I find a lot of running shirts to be too slim (I have about a 41-42 cm chest); this shirt feels nice and loose while not looking baggy. I am currently using it for travel in Europe and am happy to report that I haven taken it on 3 runs and its only just now smelling like it needs a wash. Makes packing easy.