The system is best used in varying combinations and is not meant to be layered sequentially, meaning one garment on top of another, on top of another, until you’re wearing all 7 levels. The conditions of your operating environment and the requirements of your mission will determine not only what you wear, but also what you stow in your pack for later use. The wind shirt (Level 4), in particular, is a very versatile garment meant to be sandwiched between your various layers. It allows for a more stable internal temperature to be managed, as well as reducing friction between insulation layers.

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