Size: Adjustable,fit for most adult
Because our products are new products just made, so when you receive it, there may be some smells, but the smell is harmless. You only need to put it in the sun to ventilate, and the smell will disperse.
The back of the mask is fixed by a Velcro so that you can adjust your head to fit the mask. Do not use too much force when opening the Velcro, otherwise it will damage the mask.