These face masks contain 2 layers of fabric: a cotton interior and a polyester exterior for healthy wearing and easy sublimation printing. The item is very stretchy and fits most with ease, and can be washed and worn again and again. **If you are debating between sizes, I advise sizing up.* Please see size guide in the pictures.

Additional Options:

1. You can opt to purchase an S-Hook to save your ears while wearing your mask for long hours.

2. The mask includes a slit to add a filter. You may purchase a filter to add extra protection to your mask. Note: Filters can be reused, but not washed. You will need to remove the filter before washing. (**This only applies to the Adult Large masks.)