However, to me, the critical question will be whether even with “pumping” can the comfort range of the “moderate” permeability windshirt be significantly extended beyond what is provided by a very low permeability windshirt. I can easily incorporate both internal and external air movement into this test to try to gauge the importance of pumping or low level breezes on moisture management and will take a look at this. I have voraciously consumed your work for years and appreciate all you have done. Previously it was outlawed for this market. Most news worthy to me is that Patagonia is now apparently using it on commercial garments or the fabric finish of the Patagonia Air has lower emissivity than nylon or polyester. Secondarily it will increase the insulation value as you observed. This coating is primarily intended to make soldiers outer clothing much less visible to IR night vision weapons. Military rainwear and windshirts routinely haveLWIR block coatings applied. I have measured windshirt LWIR transmission through various fabrics. Any WPB membrane and your windshirts will read similarly using your existing MVTR tester but dramatically different with it modified to add air This emulates the pumping motion caused by your body movement. You can modify your custom MVTR tester to add air to the water and clearly see this difference yourself. For active use, these moderately porous fabrics will exhibit an average of around a 300% increase in the MVTR values you indicate. It is the undefeated featherweight champion.I agree with most of what you wrote there is only one exception: MVTR tests, such as the ASTM E96, or your custom test, give an indication of MVTR for static use only. Under clear skies on a breezy day, the original Houdini is still the clear go-to. It’s a masterful antidote for light rain. It’s a high-quality piece that is worth the extra $ over the pure Houdini for weather resistance. Keeps tire-projected road rubbish off your back. The hem adjustment is excellent, and the extra back-length again makes it favorable for cycling. With a 45” chest and 36” waist, the large fit with enough room to add a baselayer or an R1 techface without snags. It just takes a bit more patience and precision. I could stuff that with a blindfold on and half-frozen fingertips. It does not pack into its pocket with the same ease as the Houdini. However, I’ve found this to be the case with any similar product.
You’ll probably see slightly more sweat in the arms and back than elsewhere, at least when riding.
#Patagonia houdini air skin
The material against the skin is more comfortable than the Houdini.
#Patagonia houdini air upgrade
It offers a nice upgrade in weather resistance / light rain from the original Houdini, with some obvious cost in breathability, but the reduction is not significant. It has an athletic fit, and plenty of length in the arms for extended movements, such as in road biking, scrambling, or trail running. This thing fills the gap between a pure wind shell and lightweight softshell with ease. When that proves to be a false alarm and the wind dies down, you can stuff it down small into its own chest pocket, stow it in a pack or on a harness, and continue along your way. It's also got a DWR (Durable Water Repellent) coating that resists drizzling rain and other light precipitation, helping to keep you dry while you push for cover in case the weather turns even more. The nylon double weave fabric blocks the wind on blustery summits, while the textured backing construction promotes greater airflow than that of a standard shell design. Finding itself in between Patagonia's soft and breathable Airshed jacket and the more robust Houdini jacket, this lightweight shell provides the best of both worlds with weather-resistant protection and a comfortable internal climate. When you know you can't do without light weather protection but don't want to get stuck with that clammy feeling that can often accompany active pursuits while wearing a shell jacket, throw on the Patagonia Houdini Air Jacket for an ideal balance between breathable comfort and wind-and-water resistant protection.
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