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This is the clothing system that was used by the US military during cold weather. It is modular so it can be adjusted according to how cold it is at the time. Add another layer in colder, windier temps. Remove a layer if it is warmer. This is ECWCS Gen 1/2.
Newest Generation:
ADS | GEN III ECWCS | The System
https://www.youtube.com/watch?v=fE_FtP_7tN0