Cavity Walls

Cavity Wall

British houses are built with cavity walls for a very good reason: it keeps the inside dry. If a single layer brick wall were used condensation would form on the inside because of cold bridging. The cavity prevents the inner wall from getting damp and airflow through the gap helps to remove excess moisture.

Layering a ShellTA over water resistant outdoor clothing (hardshell or softshell) works in a similar way, allowing the inner garment to breathe more effectively, especially where the two layers don’t touch.