What a great bit of kit. Folds flat so you can slide it in your bag if your cycling to work, no bulky hat to carry around and very light weight. A perfect piece of genious. Two latches either side held with magnets you fold the helmet and your good to go. It clips under the chin with magnets and is very comfortable. They come in many colours and you can buy them for around £100 on many different sites.
They make them for the US market and the European Market
If you wanted to know more there is a great review on youtube