MFH Gel Warmer - 2 pcs.

Color: Black
Magnification: 6x
Objective lens diameter: 20 mm
Exit pupil diameter: 16 mm
Diopter adjustment: +3
Field of view at 1000 m: 7.5 deg.
Laser activation time: 0.33 s
Power source: CR2 battery
Physical dimensions: 94 x 76 x 33 mm
Weight: 148 g
Manufacturer: GPO, Germany

To prepare the warmer for reuse, immerse it in boiling water for approximately 6 minutes, then let it cool down. The process reverses the crystallized mass back to its original state, enabling repeated use of the warmer.

The model boasts a thermal insulation coefficient of R-Value 4.7, measured in accordance with the ASTM F3340-18 standard. This coefficient indicates the level of ground insulation – a higher value signifies greater efficiency in limiting heat loss.

R-Value classification as used in the outdoor sector:

• 1.0-2.0 – optimal for summer use (overnight temperatures above approximately 10 deg. C),
• 2.1-3.5 – best suited for spring, summer, and autumn (approximately 0–10 deg. C),
• 3.6-5.0 – designed for cold environments, around 0 deg. C and subzero conditions down to roughly -5/-10 deg. C,
• 5.1-7.0 – intended for winter applications, at temperatures below 0 deg. C,
• above 7.0 – recommended for harsh winter scenarios with elevated insulation needs.

The actual thermal comfort level is affected by the entire sleep system (sleeping bag, apparel), ground type, and the user's individual tolerance to cold.