The Layering Principle for outdoor clothing seems to have been with us for a very long time even though the exact date for the identification of the concept is hard to establish. In essence the principle is to separate out the fundamental functions of clothing into differentiated garments and combine them according to need. The most common interpretation is of a wicking base layer, followed by insulation and finished with some form of waterproof shell. This allows the wearer to customise clothing on the move according to precise conditions at the time. The Snugpak Torrent is slightly at odds with this principle in some ways