Who gave Kazakhstan all that money?

Kazakhstan is building a huge tent in their capital, Astana. The tent is supposed to trap in heat from the sun to keep the temperature inside some 60°F above the ambient outdoor temperature. One of the keys to this giant tent is a 'special material that abosorbs sunlight to creat the effect of summer inside.' I really want to find out more about this 'special material'. Not only is it transparent, but apparently it is very strong - or at least I assume that it is.