The importance of the layering system is to allow yourself to safely regulate your body temperature during different levels of activity and different weather. The base layer or inner layer is close fitting thermals or shirts. The insulating layer provides some warmth and protection from the elements. It is usually a loose fitting shirt, jumper or vest. Good middle layers include lightweight down jackets or polar fleece. The outer layer or shell layer provides the most protection from the elements. This type of clothing should be fully waterproof and provide full protection even in the worst conditions.

Gore-Tex fabric contains millions of tiny holes, each of these holes is far too small for even the smallest water droplet.  A CON for the environment is: to keep Gore-Tex performing at its best, it needs to be sprayed with a toxic chemical spray. 

Wool- if it gets wet it becomes heavy and holds the water.

Cotton or denim- when becomes wet, it gets heavy. It breeds bacteria, causes chafing, and it will smother you in the heat or pull heat away from you in the cold. 

Leather- heavy, if not waterproofed correctly will get saturated.

Base- The base layer or inner layer is close fitting thermals or shirts.

Insulating layer- The insulating layer provides some warmth and protection from the elements. It is usually a loose fitting shirt, jumper or vest. 

Outer layer- The outer layer or shell layer provides the most protection from the elements. This type of clothing should be fully waterproof and provide full protection even in the worst conditions.

BASE-   INSULATING LAYER-   OUTER LAYER

Synthetic shirt-   Polar fleece jumper-   Waterproof rain jacket.