Good, interesting article, with some excellent discussion of pros/cons of (some of) the fabrics in play for layering.
The fishnet underlayer reminds me of similar sleeveless tops, generally knit polyester, I used to wear under my cycling jersey back in the day. Occasionally wore ‘em under other thin layers as well for purposes similar to those described here, but somehow moved away from that practice over the years. I’m gonna be rethinking that.
Regarding smells, I note that some posters report rare problems with odors, whilst others describe variable rates of such, depending on fabric, treatments, construction, etc. My own experience is that most synthetics tend to accumulate odors, just at different rates. MOE re: treatments is that they don’t really last very well; after a while, one is down to the native fabric behavior, it seems. But it is something I have to combat with just about all synthetics; less so with thin wool underlayers. (Icebreaker merino is my current fave.)
Query re: sizing of the Brynje Unisex Thermo C-Shirt. The sizing chart on the website includes three columns of size-guide info: height, waist, and chest dimensions. And the three don’t seem to necessarily correlate in a helpful way. Example: Size Small corresponds to a height range of 5’4”-5’6”, waist of 29-31”, and chest of 37-40”. Medium: height 5’7”-5’9”, waist 32-34”, and chest 40-42”. I’m 5’ 8-1/2”; waist 30, chest 38. Do any of y’all know the utility of the height in the sizing? It seems to me the most unreliable/unnecessary parameter for consideration.
Finally, a shout-out to the Patagonia Houdini. About an ounce lighter, with a better fit (for me, anyway) than the REI Flash, and only $10 more.