Opening at side back to add filter.
Filters are not included with purchase - I do not sell filters.
Elastic at sides to go around ears - if you have an extra large head - please let me know and I'll make the elastic bigger
See photo for size details
Washable - hand wash or use delicate cycle. Use warm or cold water and put in mesh bag if possible to protect mask. Wash with like colors. Do not put in the dryer.