Nokia has released a new product in their cool set of accessories. The Nokia X Burton Insulator Case is capable of extending the phone’s battery life by up to 50% in cold weather and sub zero temperature.
Nokia states that in test, offline streaming of Nokia Music in temperatures of minus 10 centigrade (-10°C), using the Nokia Lumia 800. Insulator Case CP-614 used.
http://www.youtube.com/watch?v=aK-nB86uEzc
[source Nokia]