1/2/2023 0 Comments Patagonia houdini air![]() ![]() If you apply such a coating to a fabric, how will it impact breathability? Also, the low emissivity coating will be reflective of adjacent heat. Low emissivity materials are often metallic. If it gets dirty, the emissity will rise. If it gets wet, the emissivity will rise. It has to be difficult to maintain the emissivity of the exterior coating. However, this coating could lead to overheating, in principle, or it could lead to increased comfort in really cold temperatures. If you can successfully reduce emissivity, the exterior garment face temperature will rise, so convective loss will increase. I did a write up of the Columbia solution here: …/evaluation-of-omni-heat-performance/ If so, I will measure emissivity and quantify the impact on thermal resistance. If you can suggest any obtainable garments that I can examine, I would appreciate it. None of the claimed “low emissivity” commercial solutions that I have examined have contributed much in terms of thermal performance. I presume you are referring to an exterior low emissivity coating. I would very much like to examine any LWIR blocking technologies. 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. I liked the fit and especially adored the adjustable hood that will not block peripheral vision.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. If you plan to wear it over sweaters extra fleece, you might want a size up. You can wear the Houdini over a layer or two of thinner clothing, but that’s about all. This shell isn’t the bulky lightweight jackets of the ‘90s. The way this jacket wears is attractive and contemporary for a windbreaker. The Patagonia Houdini makes a pretty great jacket that balances these two worlds, being super breathable while also adding a water repellent layer. ![]() If it’s genuinely breathable, some water will be able to permeate through the layer. If the shell is entirely waterproof, you will sacrifice some breathability. No jacket that is 100 percent waterproof is fully breathable. The nylon didn’t snag quite as quickly, and the feel of the seams and construction were of decent quality for the price. The ripstop nylon of this windbreaker seemed a bit more resilient than some jackets I’ve tried. With a slim fit, half elastic cuffs at the end of the sleeves, and an adjustable hood, there is a lot to like about this versatile windbreaker. Highlights of the Patagonia Houdini Jacket ![]()
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