Hello,
Thank you for contacting us. We are very sorry that you are having difficulty getting a pair of our eartips to fit properly. We do have a few suggestions:
1. Please ensure that you roll-down the foam eartips on the sound port, then with the foam compressed, reach over your head with your free hand and and pull up on your ear. This will help to open your ear canal to its fullest extent. You should then be able to insert the rolled-down eartip deeply and have it stay in place. Here's a link to the product support page on the ISOtunes website that includes an insertion video:
https://isotunesaudio.com/pages/isotunes-pro-product-support
2. If this does not work for you, then you will notice that the ISOtunes PRO product is also sold with a pair of graduated-size silicone eartips. They are designed to fit all sizes of ear canals. Although you may not get the same attenuation level (hearing protection) as with the foam, you will be well protected.
Thanks again for reaching out and I truly hope one or more of these solutions works for you. If you have any further questions or concerns please feel free to contact us at 317-740-0419 or support@isotunesaudio.com.
Team ISOtunes Audio
Because nice matters