Extended Climate Warfighter Clothing System

The Extended Climate Warfighter Clothing System, or Gen III ECWCS (), is protective clothing created in the 1980s as an exclusively cold weather system by the United States Army Natick Soldier Research, Development and Engineering Center, Natick, Massachusetts, but has been radically redesigned to cover a broad range of combat climates. The first generation ECWCS consisted of parka and trousers plus 20 other individual clothing, handwear, headwear and footwear items which are used in various combinations to meet the cold weather environmental requirements of the US military (and others). Now, the third generation, or Gen III ECWCS, has been developed to maintain adequate environmental protection in temperatures ranging between +40 and −60 Fahrenheit (+4° and -51° Celsius). Include the Modular Sleep System (MSS).
The System.
The complete system features seven levels of protection to provide defense from environmental conditions. All garments are designed to enhance a soldier's ability to train and operate in many combat conditions. 
Levels of Protection
Total weight: 12.82 lbs / 5.82kg
Initial fielding of the system began in August 2007 to the 73rd Cavalry Regiment in Afghanistan.
(2) Provided by a member of the National Guard unit identified at Fort Greely that took part in the GEN I testing.