Insulation, what to use for a emergency kit.

One of most impotent things to keep you alive are clothing and other form of insulation like a blanket of sleeping bag. Proper closing can in extreme conditions mean the difference between life and dead. In our modern world the primary role of clothing; protecting you from the environment, is of less important. There are heated cars and buildings everywhere. A lot of people cloth them self's fashionable, but not necessarily practical.

There are many article on the internet about outdoor clothing. This is a very good place to start when you are setting up clothing for your emergency preparedness. The basics are a three layer system:
- Under layer to wick away moisture from the skin
- Insulation to keep warm
- Wind proof and water proof/resistant layer to keep the weather out

There is however a important difference with the outdoors. For emergency kits, you need clothing that can be stored compacted for long periods of time and preferable durable enough to be used in less than optimal conditions.

There isn't much difference between outdoor under layers and emergency clothing. Insulation layer is a different story. With a move to ever lighter and smaller equipment, synthetic fiber or down filled jackets have been appearing as a insulating layer, replacing the traditional wool or fleece. In a preparedness point of view this lighter and smaller alternative to wool and fleece is not a solution. Emergency equipment is generally stored in kits or containers for years. This means equipment is compressed for longer periods of time. Synthetic or down require the fibers to loft to create insulation. Compressing them for long periods of time will reduce there lofting ability and making them less insulating (we are talking years on end here). Compressing fiber insulation for the first time, will cause the most reduction in loft. The compression after that are still harmful in the long term, but not as bad as the first time. If you are planning to replace them every few years, than you could use fiber based insulation. Not compressing them is also a option when space is not a issue. Wool and fleece do not compress well, but they do retain there insulating value in long term storage. They are also generally a lot more hard wearing than the insulating or down filled jackets (these generally have super thin and light outer shells).

I would also recommend fleece over wool. Fleece is much cheaper, lighter and dries out far quicker. Wool itches, stays wet for long periods of time and make you smell like a wet dog. Wool does however protects against spark, while fleece doesn't.

For the outer layer, the ultralight exteriors (Pac-lites, etc) are to vulnerable. Choose a stronger version, preferable with reinforcements on hard wearing locations. Thicker, more durable outer layers generally don't breath as well, so choose one with ventilation zips to get moisture out.

The problem with the insulating jackets not only apply to clothing, but also to sleeping bags and blankets. Synthetic and down sleeping bags are also not suitable for long term compressed storage. So use fleece or wool blankets, unless you want to replace the bag every few years. One other note, if sleeping bags are store in a reasonable accessible location (compressed or not), they will probably be abused and used a moving blankets. Things need to be moved in warehouses and moving blankets can be hard to find...