US Military OD Heat Retentive Sleeping Shirt Invisio • Function: Warm-weather uniform wear

• Function: Warm-weather uniform wear

• Function: Firefighting and cold weather foot protection

personnel during desert deployments before the transition to later camouflage patterns

Issued as part of the Individual First Aid Kit (IFAK II) system to organize and protect medical supplies in the field

US Military OD Heat Retentive Sleeping Shirt Invisio • Function: Warm-weather uniform wearThe US Military OD heat retentive sleeping shirt is a lightweight thermal base layer designed to provide warmth and moisture management in cool and cold weather environments. Its heat retentive construction helps retain body warmth while remaining breathable and comfortable during field use and sleep system operations. Color: Olive Drab Material: Polyester Function: Thermal insulation and moisture management for cold weather use Issued to U. S.