There is no swimming pool with flippers in Futian. Indoor swimming pools are relatively small. In a certain stream of people, it is easy to bump into others when using flippers, causing many unnecessary accidents. For everyone's safety, it is recommended not to wear flippers. Flippers are swimming AIDS, worn on the feet and made of rubber or silica gel. The design of flippers can increase the driving force of feet on water and help swimmers to propel and advance more effectively.