Insulation is not the only thing you need to ensure a good night's sleep.  What your body wants is to remain at a stable temperature (Homeostasis). So, what’s the problem?

• Goose down is an excellent insulator as it traps a lot of air [Still air is the best insulator we have. Think of a thermos flask]
• Goose down does not breathe very well. The insulating power means that it is difficult for moisture to escape.
• Trapped moisture leads to high humidity under your duvet. This makes you restless and reduces the quality of your sleep.
• Wool is a good insulator and absorbs moisture very quickly yet does not feel damp in any way until it has absorbed more than a third of its weight in water.
• Down or feather (which is even worse than down) can not react as quickly or to the same level. This means the humidity under a down or feather quilt is higher than when sleeping under wool.

This is one of the reasons that geese float but sheep don’t.

• Also the more feather and the less down, the poorer the insulation and the stuffier it becomes.
• Especially if you sleep with a partner you will both have slightly different metabolisms which mean your bodies will need to loose heat at different rates.
• Wool easily accommodates these differences buffering you both from the environment while maintaining your individual comfort to promote restful sleep

Dave Halley, January 2009

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