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24 votes

Why should a good tent be UV resistant?

It's because the sunlight will damage the tents fabric over time. UV damage occurs when long term exposure to the sun damages the fabric and thread of your tent or rain fly. The fabric will become ...
Charlie Brumbaugh's user avatar
22 votes

Why should a good tent be UV resistant?

A tent's UV resistance isn't for you, it's for the tent. High-energy UV rays will break down many synthetic and natural textiles over time. UV resistant fabrics are not as susceptible to this ...
Nuclear Hoagie's user avatar
15 votes

How can I cover the upper part of my nose to avoid UV radiations?

As skin cancer is such a major issue in Australia, there is a huge range of products that shield the nose. From the Australian Cancer Council, see this one which clips onto your sunglasses as an ...
Rory Alsop's user avatar
  • 24.9k
14 votes

How can I cover the upper part of my nose to avoid UV radiations?

Zinc Oxide Paste Surfers use zinc oxide for the most burnable areas of the face, and it might work for you too. It's an opaque white paste that totally blocks harmful UV. It's not greasy like ...
Robert's user avatar
  • 243
12 votes

What does "UVA in-vitro 49" mean in a sunscreen's description?

@fygsin has this more or less correct, but to expand on the answer: This is long so TL:DR - In vitro = in glass - lab based measurements, not performed using real sunlight. Higher number = better ...
bob1's user avatar
  • 10.6k
11 votes

Eye safety when starting a fire with a magnifying glass

Use your finger. Equally to using your finger to cover the sun when trying to spot something in the sky you can use the principle to cover the bright spot. You will be closing one eye and putting ...
Erik vanDoren's user avatar
9 votes

How can I cover the upper part of my nose to avoid UV radiations?

Ski goggles. They're made for just that - blocking UV - and allow you to wear prescription glasses underneath. Did just this on several summer cycling and kayak trips. All day in full sun ones, ...
Italian Philosophers 4 Monica's user avatar
8 votes
Accepted

Eye safety when starting a fire with a magnifying glass

I would just use eclipse glasses. As they are safe to look directly at the sun with, then they should be fine to look at the bright spot caused by the magnifying glass. Just make certain that they ...
Charlie Brumbaugh's user avatar
8 votes
Accepted

How much UV protection does different color linen provides?

It's interesting but just banging amazon with "linen shirt upf" didn't do anything good. But it turned up another subpage of your referenced page. It has a nice graphic with a distribution of UPF ...
Haini's user avatar
  • 590
7 votes

What is SPF in sunscreen cream?

I really like the existing answer, but I feel like it is a bit misleading in regards to what SPF really means. Reading that quote makes it seem like SPF is a linear relationship between SPF and the ...
Erik's user avatar
  • 9,648
7 votes

How can I cover the upper part of my nose to avoid UV radiations?

Thinking practically, how about just putting a bandaid on there? Or buying surfer’s sunblock that really sticks for a long time.
Sebastiaan van den Broek's user avatar
7 votes

Can natural material be found in a temperate forest to help protect against snow blindness?

Good snow goggles as described in ab2's answer take a while to make. A quick and dirty way for temporary use can be made with bark. Birch bark is probably easiest to work with, but any smooth bark ...
Sherwood Botsford's user avatar
7 votes

How can I cover the upper part of my nose to avoid UV radiations?

Some face shields also include nose protection, e.g. (mirror): Another option is using a UV face shield visor, e.g. (mirror): Good feedback on it in the comment section: That fancy visor doesn't ...
Franck Dernoncourt's user avatar
6 votes
Accepted

What to look for in eco-friendly sunblock?

This article has a list of what chemicals to avoid, why, and some good sunscreen choices. The three main points are below. Note that titanium dioxide falls under physical sunscreen but is still ...
noah's user avatar
  • 4,053
6 votes

What does "UVA in-vitro 49" mean in a sunscreen's description?

In vitro refers to tests being done "in the glass", i.e. in petri dishes or test tubes under laboratory conditions. After some googling I come to the conclusion that it very likely refers to the way ...
fgysin's user avatar
  • 13k
5 votes
Accepted

Can natural material be found in a temperate forest to help protect against snow blindness?

This answer will work only if you have a knife, preferably a multi-tool knife, and are adept at using it. Make a pair of Inuit goggles, as described in Snow Goggles, Wikipedia: The goggles are ...
ab2's user avatar
  • 23.9k
5 votes

Eye safety when starting a fire with a magnifying glass

Use a non-battery welding mask glass. You can carry it in the same pouch as your magnifying glass. One can be Purchased new for a couple of dollars. They can also be had second hand.
James Jenkins's user avatar
5 votes

Eye safety when starting a fire with a magnifying glass

One option would be to use snow glasses. They've been used for centuries to prevent snow blindness, and work by limiting the amount of light that can enter your eyes. They are simple to make, and can ...
ShemSeger's user avatar
  • 53.6k
5 votes

Best sun protection for swimming

The problem with sunblock is that it will wash away in the water and has to be reapplied constantly or it won't work. However, the most effective way to avoid sunburn that people don't think about is ...
SurpriseDog's user avatar
5 votes

How to measure combined clothing and sunscreen?

The fine answer of @Monster is correct for UVB rays, but the point raised by @imsodin is pertinent. The following information and quotes are taken from the Skin Cancer Foundation, UVA and UVB. When ...
ab2's user avatar
  • 23.9k
5 votes
Accepted

How to measure combined clothing and sunscreen?

Purely theoretical (in practice sunscreen isn't as strong as it says on the bottle to begin with) you multiply it. If 1/3rd of the UV photons make it through the first layer, and of those that made ...
Monster's user avatar
  • 1,913
4 votes

Why should a good tent be UV resistant?

It is for two reasons. By far, the primary concern is that UV rays will make the textiles deteriorate over time. UV resistant textiles will last a lot longer, and deteriorate less from only sunlight. ...
Alex Cobalt's user avatar
4 votes

How much UV radiation does one receive under water?

It turns out that this is much much more complicated than I would have thought, not being a spectroscopist other than in general use of various automated spectrometers for measurement of biological ...
bob1's user avatar
  • 10.6k
3 votes

How much UV protection does different color linen provides?

Wiki A number of fabrics and textiles in common use today need no further UV-blocking enhancement based on their inherent fiber structure, density of weave, and dye components, especially ...
paparazzo's user avatar
  • 7,176
3 votes

Where can I get long but light bottoms for water?

I was searching for something like that myself earlier this year. Living in Florida, I was trying to find long pants that are light, cool, and dry quickly that I could wear hiking, camping, and ...
Taegost's user avatar
  • 135
3 votes

Eye safety when starting a fire with a magnifying glass

I agree with Erik that the best approach is to use charcloth. It will light in seconds and allow you to transfer the embers to a birds nest for a quick start to your fire. Otherwise, yes, I've also ...
Ed B.'s user avatar
  • 31
3 votes
Accepted

How essential is the darkness/tint of a pair of sunglasses to protecting your eyes?

The dark tint isn't required for UV blocking. That's not to say it's not a good thing to have. Many plastics have strong UV absorption, and some safety glasses have an additional coating. For ...
Chris H's user avatar
  • 26.5k
3 votes

What is the difference between SPF and UPF, if any?

SPF and UPF both have very similar purposes. But the are metrics for different things - the first is for rating sunscreen creams, they latter is for apparel. The measurement method is different in ...
ahron's user avatar
  • 1,839
2 votes

temp, heat index and UV index

@BenCrowell's comment is right. This was going to be a comment agreeing with his, but grew. I think the best single number you could do is some sort of total sun risk index, which is of limited value ...
Chris H's user avatar
  • 26.5k
2 votes

Where can I find good UVI forecasts?

Check out sunburnmap.com. Just enter your city and you can get results such as this: Accuweather.com also has some hourly UV forecasts. You need to click on the hourly forecast for your location ...
wanderweeer's user avatar
  • 2,790

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