Waterproof/ water resistant: For the areas that I hike, Sierras and Southwest (Arizona), Tyvek is ideal. Testing the Tarptent Tyvek tents for a year has provided confidence that this material is the best available for now, for me personally. It has also withstood without any anxiety, just about as vicious a wind I have ever experienced.
Condensation: This factor more than any other, perhaps, has been the paramount issue in my quest for a satisfactory shelter. I have never experienced condensation with Tyvek in my 18 months of usage. I have used other pyramid tents made of silnylon with mixed results. The Hex is one of my favorite tents and although condensation occurs occasionally, it has never been so serious that it has rained condensation. The only drawback to the Hex is that it is a tad bit heavy for solo use. On the other hand, a smaller mid made of silnylon generated so much condensation I may been just as well off sleeping outside. So size may have something to do with it. The Sublite, though is a solo shelter and has never generated condensation in my experience with it. Refer to the links in Denis’s message above for more reporting on the Sublite Tyvek.
So, this tent is the result of desiring a light weight smaller mid for nasty weather that will give me the shelter for the areas I hike without the risk of condensation. The material does have limitations. It is not recommended areas that frequently experience prolonged rain.
The material is 1443 Tyvek.
To those interested,
Tim Marshall has done a pretty neat job on this tent and has put in some nice features. I will report back on these details as soon as I get a chance to put it to use.