![]() ![]() I took multiple micrographs of both fabric sides of the USED RAB Alpine. My lab tests showed the RAB Boreas was 68.7 CFM but, the USED RAB Alpine tested 111 CFM. Wlm Depondt tested approximately 75 CFM for both. I was curious as to why the “coffee filter” air permeability tests that Wim Depondt conducted on a NEW RAB Alpine seemed to indicate comparable breathability to the RAB Boreas. This is because a fabric has a greater surface area from which the water can evaporate." Finally, water evaporates more rapidly from a fabric than from a water drop of equivalent volume. Further, the time that it takes a fabric to dry is directly related to the amount of water which is in the fabric initially, the more water it holds initially, the longer it takes to dry. The primary research paper in this area said, "The main fabric property which does determine the amount of water a fabric freely picks up is thickness. If you have a suggestion for making "mm Thick" text much clearer without being significantly more verbose, I will change it. I think the original text under "mm Thick", your description, and the above alternate description all attempt to convey the same meaning. If two fabrics are the same weave / thickness but, made with different thread material, then the material with the lower regain will dry only slightly faster. ![]() Most fabric layers are more air than fiber so, it is the water in the spaces between the fibers and layers which are the primary determinate of saturated weight gain and inversely, the drying time. These discussions do get down the the core principles for UL gear: I want the utmost performance for the weight with as many uses as possible. If I want waterproof and sweaty, the niche is well covered (no pun). ![]() BTW, a poncho makes an excellent pairing with a windshirt.Īnd that the the reason for all the beefing about breathability. The DWR features are a great no-weight addition, but I'm always going to be carrying some sort of dedicated rain gear, be it jacket or poncho. It can also provide sun and insect protection. It provides the final seal to my base layer and/or midlayer choices, which provide little or no wind protection. If it has a hood and other jacket like features, so much the better, but it is still worn like a shirt. If you think if a windshirt as a shirt, used like you would use a button down shirt, I think it is easier see the uses. "My big problem with windshirts is they aren't rainproof, so I need a rain jacket in addition, in which case there's not much reason to have a windshirt also." ![]()
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