The article explains why insulation is necessary for winter overnight stays in a vehicle: after sunset the interior temperature drops significantly, and with the engine off heating is unavailable. Key measures include fitting thermal window shades, using thick curtains and blankets, and sleeping bags. Additionally, low-power electric heaters are recommended, such as the BougeRV 12V electric blanket, which plugs into the cigarette lighter, measures about 180 by 130 cm, has a maximum power of 48 W and consumes under 400 Wh over 8 hours. The blanket retails for around 13,000 yen.
