Air Permeability Puns

Obviously some amateur capability is needed for folks to determine what to make better and better masks from. Here's an easy guide on the science - https://textilelearner.blogspot.com/2013/08/study-on-air-permeability-and-porosity.html - but we need something easier still, in my opinion.

Thoughts?

https://i.imgur.com/cIrhZd5.png

Say the sleeper gets hot flashes during the night, and needs material with a very high heat transfer to transfer this heat away so the sleeper doesn't wake up. Which material should the sleeper use for: the blanket, the sheets, and the pillow case ?

I would think the moisture management is irrelevant but I'm not exactly sure. I think the average person loses a pound of water each night, mostly through breathing but also through some sweat as well. For this question we can assume that this isn't a particularly sweaty sleeper (no night sweats). OR we could get a prediction for each case.

Details on the testing:

> Testing. Before testing, all samples were conditioned. For each type of test, three replications were performed. The different standard methods American society for testing of materials (ASTM) and American association of textile chemists and colorists (AATCC) were followed to perform different tests. ASTMD2256/D2256M—10e1 was followed to test the tenacity and elongation percentage of yarns by using Yarn Tensile Tester (Tensojet, 2000). For the tensile strength of fabrics (150 50 mm2 ), ASTM D5035—11 was followed by using tensile strength tester. Similarly, for tear strength of fabrics (100 63 mm2), ASTM D1424—09, 2013 was followed. Likewise, ASTM D737—04, 2012 was followed to analyze air permeability of fabrics (20 20 cm2) by using air permeability tester M-021A SDL Atlas, UK. Similarly, AATCC test method TM (195) was followed to know the liquid moisture management properties of fabrics (8 8 cm2 ). In the same way, ASTM D1518—14 was followed for measuring the thermal resistance of fabrics (30 30 cm2 ) by using thermal resistance tester M-259B SDL Atlas, UK.

Source:

The Mechanical and Comfort Properties of Sustainable Blended Fabrics of Bamboo With Cotton and Regenerated Fibers, Abdul Basit et al. https://doi.org/10.1177/0887302X18782778

My predictions:

For Blanket: Tencel. Though Viscose has a lower thermal resistance, a very large surface area of Tencel will be exposed to air, which can facilitate a lot of heat transfer.

For sheets: Viscose. The sheets are mainly not in contact with any air, so the thermal resistance would dominate the heat transfer properties of the sheets.

For pillow case: Maybe viscose? Some of the pillow is exposed to the air, but most of it is not. Lets say that the pillow has some air permeability as well. I would imagine that the thermal resistance is still the more sig

I have worn CooperVision Proclear 1 day contacts lenses (omafilcon A) for many years. I recently moved and found a new optometrist. He did not have any of these in stock for me to order, but he gave me a sample of Coopervision Silicone Hydrogel (56%) lenses. He told me they have better air circulation, but I did not really get a good idea as to how much better they are compared to my old ones.

After wearing the sample for 5 days, I noticed that they were not as comfortable as my Proclear lenses. However, I am still trying to figure out if the added oxygen flow would be an important benefit that would outweigh the discomfort. What is your opinion on these two contacts?

Sorry if this is a basic question. I am not an optometrist and I do not know much about this field. My prescription is -2.75 for both eyes.

I did some searching and, while some threads (like this one) discuss parts of my question, none seem to address the whole thing.

Basically, traditional hardshells (GoreTex and friends) are very waterproof but only minimally breathable, leading to sweat buildup from inside the jacket during exertion. Softshells span a wide range but what they have in common is that they sacrifice full waterproofness for much better breathability. But there's a class of air permeable hardshells, such as eVent, Neoshell, Ascentshell, Futurelight, etc, which claim to be much more breathable while still waterproof (maybe not quite as much as the GoreText hardshells). How do these fit into people's layering systems? Legitimate replacement for either a softshell or a hardshell? Replacement for both? Middle piece and it's good to own all three? Niche item that doesn't serve much purpose? Also, I'm kind of curious how some of the more protective softshells (possibly with a membrane like Infinium) compare to the less protective, air permeable hardshells.

For me specifically, I live in the PNW where it's often warm and wet. Previously I've mostly toured in the spring with fair weather and worn a light softshell for that. But I'd like to tour more this year, and expect to be getting out more midwinter when the weather is wilder. That softshell is definitely on the very breathable but not super weather-resistant end of the spectrum. I also own a GoreTex (vanilla, not pro or active or any special version) hardshell I use for resort skiing. I figure I have a few options:

1. Suck it up and just wear the hardshell if there's precip in the forecast. Downside is sweatiness and heat on the skin up.
2. Bring both softshell and hardshell and only wear the latter when the softshell gets overwhelmed. Unfortunately, my hardshell wasn't really designed (or purchased) with touring in mind. It's one of the heaviest I've seen and doesn't pack down particularly small either. So it would be annoying if it mostly stayed in my pack. I think this would make the most sense if I expected to wear the hardshell most of the time (that sort of begs the question about why I'm taking the softshell at all though).
3. Same as the above, but bring a basic rain shell instead of my skiing hardshell. I figure that's smaller and lighter in the pack if I'm not wearing it, but less breathable, less durable, and just generally worse

https://i.imgur.com/cIrhZd5.png

Say the sleeper gets hot flashes during the night, and needs material with a very high heat transfer to transfer this heat away so the sleeper doesn't wake up. Which material should the sleeper use for: the blanket, the sheets, and the pillow case ?

I would think the moisture management is irrelevant but I'm not exactly sure. I think the average person loses a pound of water each night, mostly through breathing but also through some sweat as well. For this question we can assume that this isn't a particularly sweaty sleeper (no night sweats). OR we could get a prediction for each case.

Details on the testing:

> Testing. Before testing, all samples were conditioned. For each type of test, three replications were performed. The different standard methods American society for testing of materials (ASTM) and American association of textile chemists and colorists (AATCC) were followed to perform different tests. ASTMD2256/D2256M—10e1 was followed to test the tenacity and elongation percentage of yarns by using Yarn Tensile Tester (Tensojet, 2000). For the tensile strength of fabrics (150 50 mm2 ), ASTM D5035—11 was followed by using tensile strength tester. Similarly, for tear strength of fabrics (100 63 mm2), ASTM D1424—09, 2013 was followed. Likewise, ASTM D737—04, 2012 was followed to analyze air permeability of fabrics (20 20 cm2) by using air permeability tester M-021A SDL Atlas, UK. Similarly, AATCC test method TM (195) was followed to know the liquid moisture management properties of fabrics (8 8 cm2 ). In the same way, ASTM D1518—14 was followed for measuring the thermal resistance of fabrics (30 30 cm2 ) by using thermal resistance tester M-259B SDL Atlas, UK.

Source:

The Mechanical and Comfort Properties of Sustainable Blended Fabrics of Bamboo With Cotton and Regenerated Fibers, Abdul Basit et al. https://doi.org/10.1177/0887302X18782778

My predictions:

For Blanket: Tencel. Though Viscose has a lower thermal resistance, a very large surface area of Tencel will be exposed to air, which can facilitate a lot of heat transfer.

For sheets: Viscose. The sheets are mainly not in contact with any air, so the thermal resistance would dominate the heat transfer properties of the sheets.

For pillow case: Maybe viscose? Some of the pillow is exposed to the air, but most of it is not. Lets say that the pillow has some air permeability as well. I would imagine that the thermal resistance is still the more sig

https://i.imgur.com/cIrhZd5.png

Say the sleeper gets hot flashes during the night, and needs material with a very high heat transfer to transfer this heat away so the sleeper doesn't wake up. Which material should the sleeper use for: the blanket, the sheets, and the pillow case ?

I would think the moisture management is irrelevant but I'm not exactly sure. I think the average person loses a pound of water each night, mostly through breathing but also through some sweat as well. For this question we can assume that this isn't a particularly sweaty sleeper (no night sweats). OR we could get a prediction for each case.

Details on the testing:

> Testing. Before testing, all samples were conditioned. For each type of test, three replications were performed. The different standard methods American society for testing of materials (ASTM) and American association of textile chemists and colorists (AATCC) were followed to perform different tests. ASTMD2256/D2256M—10e1 was followed to test the tenacity and elongation percentage of yarns by using Yarn Tensile Tester (Tensojet, 2000). For the tensile strength of fabrics (150 50 mm2 ), ASTM D5035—11 was followed by using tensile strength tester. Similarly, for tear strength of fabrics (100 63 mm2), ASTM D1424—09, 2013 was followed. Likewise, ASTM D737—04, 2012 was followed to analyze air permeability of fabrics (20 20 cm2) by using air permeability tester M-021A SDL Atlas, UK. Similarly, AATCC test method TM (195) was followed to know the liquid moisture management properties of fabrics (8 8 cm2 ). In the same way, ASTM D1518—14 was followed for measuring the thermal resistance of fabrics (30 30 cm2 ) by using thermal resistance tester M-259B SDL Atlas, UK.

Source:

The Mechanical and Comfort Properties of Sustainable Blended Fabrics of Bamboo With Cotton and Regenerated Fibers, Abdul Basit et al. https://doi.org/10.1177/0887302X18782778

My predictions:

For Blanket: Tencel. Though Viscose has a lower thermal resistance, a very large surface area of Tencel will be exposed to air, which can facilitate a lot of heat transfer.

For sheets: Viscose. The sheets are mainly not in contact with any air, so the thermal resistance would dominate the heat transfer properties of the sheets.

For pillow case: Maybe viscose? Some of the pillow is exposed to the air, but most of it is not. Lets say that the pillow has some air permeability as well. I would imagine that the thermal resistance is still the more sig

https://i.imgur.com/cIrhZd5.png

Say the sleeper gets hot flashes during the night, and needs material with a very high heat transfer to transfer this heat away so the sleeper doesn't wake up. Which material should the sleeper use for: the blanket, the sheets, and the pillow case ?

I would think the moisture management is irrelevant but I'm not exactly sure. I think the average person loses a pound of water each night, mostly through breathing but also through some sweat as well. For this question we can assume that this isn't a particularly sweaty sleeper (no night sweats). OR we could get a prediction for each case.

Details on the testing:

> Testing. Before testing, all samples were conditioned. For each type of test, three replications were performed. The different standard methods American society for testing of materials (ASTM) and American association of textile chemists and colorists (AATCC) were followed to perform different tests. ASTMD2256/D2256M—10e1 was followed to test the tenacity and elongation percentage of yarns by using Yarn Tensile Tester (Tensojet, 2000). For the tensile strength of fabrics (150 50 mm2 ), ASTM D5035—11 was followed by using tensile strength tester. Similarly, for tear strength of fabrics (100 63 mm2), ASTM D1424—09, 2013 was followed. Likewise, ASTM D737—04, 2012 was followed to analyze air permeability of fabrics (20 20 cm2) by using air permeability tester M-021A SDL Atlas, UK. Similarly, AATCC test method TM (195) was followed to know the liquid moisture management properties of fabrics (8 8 cm2 ). In the same way, ASTM D1518—14 was followed for measuring the thermal resistance of fabrics (30 30 cm2 ) by using thermal resistance tester M-259B SDL Atlas, UK.

Source:

The Mechanical and Comfort Properties of Sustainable Blended Fabrics of Bamboo With Cotton and Regenerated Fibers, Abdul Basit et al. https://doi.org/10.1177/0887302X18782778

My predictions:

For Blanket: Tencel. Though Viscose has a lower thermal resistance, a very large surface area of Tencel will be exposed to air, which can facilitate a lot of heat transfer.

For sheets: Viscose. The sheets are mainly not in contact with any air, so the thermal resistance would dominate the heat transfer properties of the sheets.

For pillow case: Maybe viscose? Some of the pillow is exposed to the air, but most of it is not. Lets say that the pillow has some air permeability as well. I would imagine that the thermal resistance is still the more sig