The Extreme Cold Weather Sleep System (ECWSS) will provide environmental protection between +40°F and -45°F and is intended to be used with the foam sleeping mat.

The ECWSS is designed to be used with the insulating clothing layers of the Extended Cold Weather Clothing System as supplemental insulation.

sleeping bag / hood, socks, stuff bag / bivy cover

Component

• an extreme cold weather sleeping bag
  • type I of MIL-S-44309
• a hood and socks
  • MIL-H-44308
• a bivy cover
  • MIL-C-44307
• a stuff bag
  • MIL-B-44306

Specification

• MIL-S-44361

Logistics

• Set: 8465-01-306-2681 [pdf] (TAMCN: V46252F)
  • ECW sleeping bag: 8465-01-305-6991
  • hood and socks: 8465-01-305-6359
  • bivy cover: 8465-01-305-4688
  • stuff bag: 8465-01-305-6360

Similar Item

• Intermediate Cold Weather Sleeping System

Improvement

• Modular Sleep System

Reference

• TM 10-8400-203-23. 1990 with changes 1-11. Chapter 20.
• TM 10-8400-203-23&P. 2010. page 0002-23.
• https://www.marcorsyscom.usmc.mil/sites/pmice/Operations/STAP/CATALOG/pubs/SLEEPING%20SYSTEM%20ECW.pdf
• http://www.marines.mil/news/publications/Documents/MCO%203470.3.pdf
• Phlillip W. Gibson, Laboratory Evaluation of Two New High-Performance Polyester Batting Insulation Materials. 1990. [pdf]