This product can be used in the southern winter, but not in the northern winter.
Usually in the south, when the winter temperature is above 0 degrees, water in glass at 0 degrees does not freeze; in the north, when the winter temperature is below 0 degrees, glass water does not freeze; at 0 degrees it will freeze, which won't be as effective as a glass of water.
Car glass water is generally divided into 0°C glass water used in summer and -20°C and -35°C glass water used in winter. Glass water that still doesn't freeze at minus 40°. It is a special type of antifreeze and is suitable for the north. Used in very cold areas.