The Extreme Cold Weather Sleep System (ECWSS) will provide environmental protection between +40°F and -45°F (+5°C and -46°C) 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 (ECWCS) as supplemental insulation.

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

National Stock Number

• Set: 8465-01-306-2681
  • 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

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