The design challenge of the new Bering sleeping bag was to improve its insulating properties and breathability without having a negative impact on weight and pack size. The integrated Black Yarn technology, which encapsulates micro-fine carbon particles in a synthetic nylon fibre, makes it possible not only to charge the fabric with heat when exposed to sunlight, which it later emits again, but also to create a much stronger insulation. The Thermo Dry Soft filling guarantees that moisture is efficiently transported away, creating a comfortable climate for sleeping without heat accumulation.