Nanga built their reputation on developing sleeping bags designed to perform in some of the most extreme climates on Earth. 
The Aurora Light 450DX is a three-season bag with a 760FP duck down created to perform optimally at 0C but will do the job when temperatures drop as low as -5C. The material used is a lightweight Aurora Light material developed by Nanga, which is waterproof and breathable, in unison with a single quilt structure giving an even spread of insulation and comfort at minimal weight.