Hi kharrell

I would actually caution anyone buying this bivi shelter. I think it could be potentially dangerous. The reason I say this is because of the design and the materials it is made from. The spec on the website do not give any value for the materials breathability but only the hydrostatic head value. As the design appears to be able to be fully sealed up, there could be an issue of dying from suffocation during the night. It would also be a rather uncomfortable nights sleep even it wasn't sealed up being wet and clammy and therefore being eventually cold. The material used in very important in the design of bivi's. I would only really recommend a MVP material such as Goretex or Event in the design of a bivi bag. The most cost effective bivi I have come across is the British Army MVP (Goretex) bivi available in OG and DPM but yet is still 4 times the cost of this bivi.