Sounds like bullshit. 15.6 degrees would just require better insulation to trap body heat, maybe even a sleeping bag level insulation. 18-20 degrees is where th

Sounds like bullshit. 15.6 degrees would just require better insulation to trap body heat, maybe even a sleeping bag level insulation. 18-20 degrees is where the lowest bound is for a regular blanket and some pyjamas.