As long as the inner layers are dry, heat won't be transported away and the temperature will stay high (top). But as soon as water starts condensing on the inside, the insulation starts leading heat away from your body and you start freezing (bottom).
… I have a small favor to ask.
Support the Global FlyFisher through several different channels, including PayPal.
The Global FlyFisher has been online since the mid-90's and has been free to access for everybody since day one – and will stay free for as long as I run it.
But that doesn't mean that it's free to run.
It costs money to drive a large site like this.
See more details about what you can do to help in this blog post.