Why a down sleeping bag?

If you're looking for the ultimate in comfort and performance for those cold nights out in the elements, there's nothing like a down sleeping bag to ensure a perfectly restful sleep giving your body a chance to regenerate in preparation for the following days exertions. It's a well-known fact that if you sleep better, you're sure to have more energy for the next day. 

Modern technology has produced some excellent man-made fibres, which have resulted in the development of some really compact and lightweight sleeping bags but there's still no comparison with a down sleeping bag when you are looking for super-light performance.