What quilt is suitable for winter in South China?

Winter in the south is still warm, at least a few degrees. For example, in Guangdong, it is enough to wear a thin coat in winter, and the coldest is about 4 to 6 degrees. So you just need to cover it with a thin quilt. The requirements are not high, unlike in the central region, because there is no collective heating, it is still relatively cold in winter.