I contacted Sennheiser to ask where I could purchase replacement silicone ear adaptors for my new Momentum TW3's as I couldn't find them anywhere on the Internet, including Sennheiser's website. I was informed that Sennheiser did not currently make a replacement silicone adaptor for the Momentum TW3. I was advised that silicone adaptors for previous models were available and were of similar size. I ordered the medium TW2 replacement adaptors (5 pair pack)
They are of similar size, much emphasis on the similar...They are slightly smaller and tighter and do take some fiddling to get them onto the units, not great for arthritis sufferers. But once on they fit the ear nicely... However, it wouldn't take a genius to realise owners of the Momentum TW3's would need replacement ear adaptors and Sennheiser should have had them available from the launch of the units.