Slippers in the markets of Zhengzhou City, central China's Henan Province, bear the names, ages and other personal information of missing children in a bid to help bring them home. /VCG Photo

Cai Lei, a wholesale merchant who runs a slippers business, has been printing missing children's information on slipper labels since 2015. /VCG Photo

He has partnered with a platform that helps to find missing children, hoping that more missing children will be found and returned to their families. /VCG Photo

He has sold more than eight million pairs of slippers in the past four years. /VCG Photo