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This is an adjustable slipper, it can be unfolded into a flat after be took off and the wings can also be buckled on to use. You can bend one or two layers according to the size of your foot.
Yingxin Zhao , Heshan Liu , Zhenya Wang
Cong Sun , Bingtian Huang , Lei Lv，Feng Sun，Kaiqian Geng，Wenbin Hu，Kaihong Wang，Gang Jing