INSTRUCTIONS
During times of intense physical exertion, dressing too warmly can actually make you feel cold. The perspiration is unable to escape and therefore remains in constant contact with your skin. It is therefore useful to have a liner jacket that you can remove in more mild temperatures. It's also important to open the vents before you get too hot and close them before you get cold when the intensity of your physical effort decreases, as it does on the ski lifts.
How to stay warm and dry?
To keep warm and dry, use the 3-breathable-layers rule: 1 skiing base layer, 1 liner jacket to retain warmth, 1 ski jacket to protect you from the elements.
The first layer:
This keeps you dry by wicking away the perspiration from the skin to the other layers.
The second layer: to provide warmth, you need to wear a second layer that insulates you from the cold.