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Im considering a naturehike mongar 2person, but in the colour I want and expandable awning they only do in 15D flysheet.
Is that good enough for uk mountains and rain, or do you need 20D?
That is quite a good question. I had a terra nova solar that is 10d according to current specs. It was a few years ago so could have been thicker then although the weight is apparently the same. I used it in the alps in heavy rain and sub zero conditions, it was fine. I also have a terra nova Voyager ultralight, it's apparently 30d. It's had heaps of year round use, Scottish/alps etc and now leaks a bit and I regularly reproof it. It is obviously thicker material than the solar which was practically see through.Â
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So id say the thinner deniers are probably ok but probably not as long lasting, especially from UV degrading. Trade off is weight.
I think the important thing is the design/shape of the tent, in other words is it strong enough to withstand rough weather. If it isn't, a thicker material isn't going to help muchÂ