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This review is from: Comply Tx-500 Isolation PLUS Earphone Tips - (S/M/L) Black (Electronics)
I ordered these to go with my bluebudss x bluetooth in ear phones for running and gym, the standard buds get sloppy and slip out of my ears enough to lose bass, these do not they stayed in place for a full 40 minutes run, I am amazed at how well they worked.
Choosing the size was difficult so I ordered the pack of the sizes and found I needed the large ones, just squeeze them to make them small then push into the ear and wait 30 seconds for them to expand and lock tight