https://www.theverge.com/tldr/2017/9/14/16307226/iphone-x-taobao-faceid-help-me-cover-my-face-masks

Chinese vendors on online marketplace Taobao never resist a chance to peddle their goods. Just days after Apple announced the iPhone X that replaced the home button’s Touch ID for Face ID, Chinese merchants have launched “protective masks” in response to the news.

If you’re worried that someone will unlock your phone while you’re sleeping (which is probably unlikely, given that Face ID has been designed to not work when your eyes are closed), there are a number of masks you can order straight to your house for $5 to $15. Do you want one or three exposed holes on your mask, or none at all? Or is black too plain and you’d prefer green?