I am 70 years old. Despite my age, I still have very good hearing. I have used in-ear headphones from many different companies. Sony, Harman Kardon, Bang & Olufsen, RHA, Sennheiser, and several others. I have used headphones on the street, at home, at work, in the hospital, and at the gym. I have been using Comply foam tips for years. They are the best of the best in the world. The improvement in sound quality when using them is noticeable. There is also a significantly reduced impact of ambient noise when using Comply tips. Among their other advantages, the available cleaning kits in the store allow you to keep the tips clean and extend their lifespan. A very important advantage is the ease of inserting headphones equipped with these tips into the ears. They don't cause fatigue! They are excellent! I recommend them to everyone who does not part with music on a daily basis.
Since the "M" sized insoles I ordered turned out to be too big, the company Comply sent me the "S" sized insoles without any problem.
Thank you, Comply. Best regards, Michał.