Rich's Tongfamily (Richtong.net add-on)

Technical The layering system
We’ve all heard about it, but just in case you’re not sure, here’s a quick explanation of what is what and why you need to use it.
The Base Layer sits next to the skin. It draws moisture (sweat) away, keeping the skin dry and warm. The best fabrics to choose are synthetic polyester yarns. Forget cotton right now; it stays wet and heavy and you’ll smell by the end of the day.
The middle layer is the insulating layer. It’s the filling in the wicking system sandwich and allows moisture to escape, but keeps the heat in. Try and keep it lightweight ? Microfleece is a good fabric to choose. Bear in mind during the spring that this layer can sometimes be the top layer too ? so maybe think windproof?
The outer layer is the breathable but weatherproof one. The ideal fabric for your jacket and pants should have a system of microscopic holes in it that are small enough that rain and wind can’t penetrate, but big enough to let the moisture out. If it claims to be waterproof, make sure the seams are taped ? needles make holes.
Some final advice on layering: natural fibres aren’t good for skiing. Especially not those cotton polar-necks everyone used to pose about in. And don’t forget about your hands, feet and head ? keep them warm, too.