Sil Nylon works for wet weather but it does not work for a sun shelter which is important in this part of the country. It is too translucent. I use a Sea to Summit regular nylon poncho/tarp. It keeps the rain off me and my pack, makes a decent sun shelter and a small place to get out of a shower to cook. I wish they made it a bit bigger though. I would like it to cover my arms better but I have not found a poncho that does that so far. Sea to Summit does make a good sil nylon poncho/tarp as well.