Winter is coming, and temperatures are about to drop sharply in most cities in China. Many people in northern areas have put on their heavy winter clothes to resist the cold, including qiuku, also called long underwear or long johns in English.

Long underwear is a style of two-piece underwear with long legs and sleeves normally worn during cold weather. Due to its pronunciation in Chinese, people call it jokingly "chill cool". When it gets colder in autumn, wearing one pair of trousers is not enough, so people will wear another pair of close-fitting trousers under the outside one.