Amazon.com: Luckvan Memory Foam Eartips for Sony WF-C500/LinkBuds S Earbuds Tips Sony WF-1000XM4/1000XM3 WF-1000XM5 WF-XB700 WI-1000X fit Charging Case 3 Pairs LMS Black : Electronics
Amazon.com: JNSA Replacement Memory Foam Ear Tips Noise Canceling Foam Ear Tip Compatible with Sony WF-1000XM4 / 1000XM5 Earbud Headphones, [Fit in Case],L/M/S 3 Size 3 Pairs,Black (Foam4XM4B3P) : Electronics
EP-400 replacement ear tips made of memory foam
Amazon.com: ALXCD Foam Ear Tips Compatible with 4.0mm Connect Hole, Medium Size 4 Pairs Soft Memory Foam Earbud Tips, Fit for Most in-Ear Headphones, Foam, Black Gray Red Blue : Electronics
Amazon.com: Comply Isolation T-600 Memory Foam Replacement Earbud Tips for Cambridge Audio Melomania 1, 1More Quad Driver, Moondrop Blessing2, Plantronics, Pioneer, and more Earphones (Assorted, 3 Pairs) : Electronics