I didn't know how to use this until I read further down on the page
In the description, you get "Easy to USE: It has two fixing clips on both sides, and you can hang the 3D bracket on the face cover to prevent sliding. Then put on the face cover as usual." No, you can't. Further down you will see that they recommend either sewing it in place or using double sided tape. I was able to wear mine without any complications.
Rating: 4 stars