I use these kind [1][2] of silicone ear-plugs to sleep, although I buy them in local pharmacies. Last week there was a festival where I live, with loud music and DJs at least 4:00 am, and it damped the noise by a lot, enough to let me sleep.
They are a bit uncomfortable to use at first, but I got used to them in 2/3 nights.
I'm guessing it's something similar to these, they come in different brand names depending on which country you're in and I can highly recommend them, having tried many different earplugs myself. Much more effective than the foam types and almost as cheap:
I don't like using them full size because they tend to make my ear sore when worn for long periods, so I cut about 1/4" off the smaller end. I wash mine when I take a shower, so this bottle of 50 pairs has lasted nearly 10 years.
I have tinnitus caused by working in a computer room with loud blowers, and wearing ear plugs most of the time helps a lot. Good luck!
Yep, those are the ones. I roll one into a ball then push it in.
The silicone deforms to the shape of your [outer-ish] ear canal, and is a bit tacky which helps create a better seal and maintain it through the night. Cheap and worth a shot.
They are a bit uncomfortable to use at first, but I got used to them in 2/3 nights.
[1] https://kathmandu.imgix.net/catalog/product/6/1/61247_earplu...
[2] https://www.amazon.com/Reusable-Silicone-Earplugs-Reduction-...