On July 23, Jiande of Hangzhou held "Winter Swimming in Summer" International Challenge in Xin'an River. More than 3,000 people participated in the event, including 130 teams all over the country, and 12 international friends from six countries.

"Winter Swimming in Summer" is a competition conducted in the low temperature environment, which has high requirements for physical fitness and swimming skills of participants. This mass sports event has been held for 22 times, and it is the brand event of Jiande.