Decided to spend my 10 and some change REI dividend and use the 20% off coupon. Looked primarily at clothes. Was pleasantly surprised to find a shirt–“Screeline Plaid” with a great warm/hot weather fabric blend–63% nylon, 34% lyocell (tencel) and 3% spandex. The fabric blend is almost ideal for more humid, hot and warm weather activity.
I have a couple other thin, button up shirts that are blend of nylon and tencel, but they are about half and half ratio. They have really good odor control, dry pretty quickly, are very comfortable, are tough and pretty light. The above REI shirt is even lighter, will be a bit more tough with higher nylon ratio and also will dry a bit more quickly.
I’ve noticed that despite being primarily cellulose like cotton, tencel dries noticeably faster than cotton and also despite that it has a bit higher initial moisture regain. I’m not 100% sure why that is, but i suspect that it’s due to a combo of it’s difference in physical structure vs cotton. Tencel fibers are finer (usually at or near microfiber size), round, and have an interesting nano fibrillation as part of it’s structure (part of why it’s so strong–it’s tensile strength is close to common polyesters). Otherwise, i don’t know how to explain it.
It’s pretty close to an ideal blend according to a study by Lenzing that measured different synthetic (polyester) and tencel blends for wicking, comfort, drying speed, etc. Lenzing found that a ratio blend of 70% synthetic to 30% tencel was the most efficient all around. (Contrast this with Optimer’s studies with polyester and cotton blends, which found that 10 to 15% cotton blend was more ideal and which led to the development of “Dri Release” blends).
Anyways, the REI shirt wicks really, really well, dries pretty fast (though not as fast as a thin, 100% polyester shirt), and is noticeably cooling on the skin when damp. Based on my experience with other nylon tencel blends, it should have pretty good odor reducing properties, but with a bit higher synthetic ratio–probably a bit less effective.
It’s pretty close to being an ideal fabric blend for hot and more humid weather. It’s fairly breathable, but seems just tightly woven enough to block most insects–though i will need to test that to be more certain.
My ideal fabric for hot, humid weather though, would be a similar ratio blend, but of flatter fiber wicking nylon with linen. Something like 70 to 75% nylon to 30 to 25% linen. But nylon-linen blends are extremely hard to find in general, and especially in men’s clothing.
A decent substitute for the above, is the fabric that Prana uses in some of their clothing. They have some shirts, pants, and shorts made with 53% hemp, 44% polyester, and 3% spandex. A pretty good, hot and humid weather fabric that is not well known and is very underrated (hemp is a lot like linen in most regards). Part of the problem, besides marketing, is the design of the pants that they make out of the fabric–not very good for backpacking.
A couple things i don’t like about the REI shirt–one, it is short sleeved–would prefer long sleeved, and two-the colors they had weren’t light enough. I got the “Seattle Mist” color, and then bleached it a bit, but still not light enough for sun use (i prefer light khaki’s, light grey’s, light tan’s, etc). Also, it’s more form fitting than i prefer in a button up. I usually wear a medium, but this is a little over tight in the shoulders and arms (they didn’t have a large in that color there).
Regular cost is 54.50. On sale, clearance, or with a coupon, it’s a pretty nice shirt all around. Would not recommend it for cold or cooler and wet conditions though–it’s a cooling and not well insulating fabric.

