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Post by dayhiker on May 7, 2021 8:02:37 GMT -8
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reuben
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Sun Hoody
May 7, 2021 15:36:40 GMT -8
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Post by reuben on May 7, 2021 15:36:40 GMT -8
Interesting that it's UPF 50+ (typically high frequency UV) and also claims to reflect 71% of NIR (near infrared, lower frequency).
Maybe it just lets through the visible spectrum, I dunno.
I also wonder if it's a solution in search of a problem.
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zeke
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Post by zeke on May 7, 2021 17:14:14 GMT -8
Several years ago, I bought a Reel Legends hooded shirt for sun protection while paddling. It listed a SPF50. Worked well for me. I'm not buying this new shirt has any better performance, and the new shirt costs twice what the Reel Legends shirt did. Both are thin cloth and cut to fit.
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Sun Hoody
May 7, 2021 17:23:21 GMT -8
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Post by High Sierra Fan on May 7, 2021 17:23:21 GMT -8
I don’t think simply being white indicates reflectivity. Look at polar bears. Their seeming white fur is actually deliberately structured to let through the warming light to get absorbed into their black skin. The individual hairs are actually transparent, it’s their hollow structure that causes the white. Oh and my then local zoo (San Diego) had some of the article’s mentioned green bears: Cyanobacteria (blue-green algae) ruling as they do! www.loc.gov/everyday-mysteries/item/is-a-polar-bears-fur-transparent/So I could see varying fabrics from different materials having different spectrum absorbance characteristics. Good timing! fb.watch/5lERiZfrM9/
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reuben
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Sun Hoody
May 8, 2021 1:29:42 GMT -8
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Post by reuben on May 8, 2021 1:29:42 GMT -8
There are all sorts of fabrics and paints which have special spectral and thermal properties - think military.
I just don't think that I need something with the characteristics of this particular item.
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Post by dayhiker on May 8, 2021 19:22:44 GMT -8
www.rei.com/learn/expert-advice/sun-protection.htmlSays darker colors which absorb is better, I was think reflecting would be even better, of course tighter weave, synthetic fibers better. UPF of 50 is really good, Interesting about polar bears, but otherwise I would take white clothing over say black in a desert.
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Sun Hoody
May 9, 2021 6:14:33 GMT -8
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Post by High Sierra Fan on May 9, 2021 6:14:33 GMT -8
Yet people who live in the desert seem to choose dark? Bedouin robes either very dark blue or black etc. Maybe influenced by their materials selection?
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rebeccad
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Post by rebeccad on May 9, 2021 8:12:10 GMT -8
I will also take loose-fitting over snug for hot conditions. I don’t know about differences in sun protection, but the looser fit allows a little air circulation and feels much cooler and more comfortable to me. I really dislike snug-fitting anything (well, aside from socks and undies 😜).
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Post by dayhiker on May 9, 2021 10:39:57 GMT -8
Yet people who live in the desert seem to choose dark? Bedouin robes either very dark blue or black etc. Maybe influenced by their materials selection? I knew that their robes were better than shorts, but not the black over white part: "Bedouins' robes, the scientists noted, are worn loose. Inside, the cooling happens by convection – either through a bellows action, as the robes flow in the wind, or by a chimney sort of effect, as air rises between robe and skin. Thus it was conclusively demonstrated that, at least for Bedouin robes, black is as cool as any other colour." www.theguardian.com/science/2012/aug/19/most-improbable-scientific-research-abrahamsIf I am following the science of the Bear and the now the robe waves that are not absorbed are passed through. The loose clothing in the case of the robe allows the air to dissipate it while not being conducted to the skin (as much?) The Hoody above says it reflects and blocks (via reflection or absorption?). I am curious do you hike in a black shirt and pants then?
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Post by JRinGeorgia on May 9, 2021 11:11:01 GMT -8
On the other hand, dark colors attract mozzies.
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Post by dayhiker on May 9, 2021 13:02:57 GMT -8
I don’t think simply being white indicates reflectivity. Look at polar bears. Their seeming white fur is actually deliberately structured to let through the warming light to get absorbed into their black skin. The individual hairs are actually transparent, it’s their hollow structure that causes the white. Oh and my then local zoo (San Diego) had some of the article’s mentioned green bears: Cyanobacteria (blue-green algae) ruling as they do! www.loc.gov/everyday-mysteries/item/is-a-polar-bears-fur-transparent/So I could see varying fabrics from different materials having different spectrum absorbance characteristics. Good timing! fb.watch/5lERiZfrM9/Nora has a new home, I saw her a couple of weeks ago. So thinking about this, it seems what this really means that what light is reflected is white? Black means no reflection, but could also have pass through? (Though I think true black does not occur in nature, or at least living things?). I guess this is like a white T letting light through because of a loose weave, and a black T would do the same but also absorb some and be warmer? Of course a white fabric dyed black might not pass on as much as well? === Edit The other thing about white is it might reflect in many angles and eventual pass thru, while the black that is absorbed only passes out as heat? (not counting that which isn't absorbed so passes through like with a loose weave)
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Post by High Sierra Fan on May 10, 2021 2:01:44 GMT -8
Yet people who live in the desert seem to choose dark? Bedouin robes either very dark blue or black etc. Maybe influenced by their materials selection? I am curious do you hike in a black shirt and pants then? Mostly black shorts or pants, RailRiders VERSATAC ULTRA-LIGHT shorts or pants most recently. www.railriders.com/men-versatac-ultra-light-shorts-p-996.html?cPath=104_112 Dark blue shirts, some dark green, some others are black. And you wear all white? Even after Labor Day?
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zeke
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Post by zeke on May 10, 2021 2:47:22 GMT -8
Personally, I don't wear dark colors hiking in the desert SW, or much anywhere. Khaki long pants, or light grey, along with a variety of brightly colored long sleeve shirts, to keep the sun off. I burn easily, and never tan. Shirts will be neon green, or red, or possibly grey with a large red stripe. I'm not out there to blend in, so my choices of shirts are mostly bright colors that can be seen easily that I also use while riding a bike on local roads.
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Post by dayhiker on May 10, 2021 6:12:02 GMT -8
After Labor Day I don't really pay attention to color, if I am not wearing wool pants for skiing, then I continue to wear my kaki pants. If it is hunting season I might prefer a bright top. My favorite item for sun was a Patagonia sun "jacket" , and bit thick material but it fit loose and even had huge pockets like a sweat shirt but with zip closure, but I have had it darned a couple of time not sure why it does not hold anymore, I got it on sale, and they don't make anymore esp. in. a light color. Spring skiing I have white long underwear with kayak shorts and underwear type fitting top, I find if it is cold, like in the winter the sun is usually not too much help, and when it is hot when the sun is out more and higher up etc, the white helps. I guess I should wear aluminum clothing to really get the reflection going.
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rebeccad
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Post by rebeccad on May 10, 2021 6:48:19 GMT -8
I find that when it’s cold, black clothes in the sun are nice and warm. But I have to admit that I haven’t actually tested that—all my longies are black.
It occurs to me that I could run some simple experiments with the sun, a thermometer, and a pair of tee-shirts, one white, one black. I have all those ingredients.
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