(Note: as of October 2020, all Revelle masks are available in 3 options: overhead straps, overhead elastic, and adjustable ear loops. You may select yours on any mask page)
If you have purchased a mask with "overhead strings", you may replace the strings with an elastic.
The tie is a long string that can be pulled out.
On one side of the mask we have an elastic corner which is sewn with a little thread.
To take out the string, gently cut the thread with little scissors. Once you remove the thread, the string will come out easily.
Once the string is out, you may insert the elastic loops.
You can order a simple Elastic Mask Conversion Kit.