This winter I have been testing the Mission Workshop Advanced Projects: Seamless Base Layers. The product specifications for this one of a kind base layer can be found in here on fat-bike.com.
I am 6′ 3″ and very slim. I ordered a size large for both the shirt and bottoms for the Seamless Base Layers. I found the shirt fit me very well. I ordered the large in the bottoms, to get a good fit in length, but found that in turn, the waist was a bit loose for me. A size medium in bottoms may have been a better fit.
Mission Workshop Advanced Projects: Seamless Base Layers incorporated 37.5 technology. This technology removes moisture before it is even formed. Overall, I found that this technology works well. I did not seem to notice the sweating as much when I wore the Seamless Base Layers while out riding. Sweating to some extent is unavoidable though, so do not think you will not sweat at all with this technology.
These space-age base layers claim that they will not produce a body odor stink, after several days of wear. I found this to be true if I did not wash my base layers for 2-3 days of exercise. After about day three, the base layers did begin to smell a little. Additionally, after 2-3 days of use, without washing the base layers begin to lose their elasticity and develop a clammy feeling when worn. Once laundered I found that this clammy feeling disappeared and the elasticity of the products was revived.
Overall, this Mission Workshop Advanced Projects: Seamless Baselayers are very comfortable and do as claimed. I personally prefer the wicking capabilities of the Merino Wool base layers that I typically wear. The Mission Workshop Advance Projects: Seamless Baselayers are comparable in price to high-quality merino wool, at $95. They do provide a lighter, sleek and more contouring feel, than the softer more noticeable feel of merino wool.
I would rate the Mission Workshop Advanced Projects: Seamless Baselayers 4 out of 5 fireballs.