Ear Gear Mini Hearing Aid Comfort & Protection – Fits Hearing Instruments 1” to 1.25” – Secure Your Hearing Aid or Hearing Amplifier – Protect from Sweat, Dirt, Moisture and Wind Noise

For some reason these don't seem as good as passed pairs. They used act quite well as a windshield when out doors but now not so much. The manufacturing quality seems a little less too. Already after just 2 months the zig zag thread has pulled out making it difficult to stay in shape and to get the hearing aid through.

Good product that does what you expect. It may not be the cheapest but the customer service is excellent

Very easy to slide onto hearing aid. Advised by audiology nurse to get these to stop sweat from affecting the hearing aid. They work very well, although not deemed to be waterproof. While rather pricey for what you get, they make up for that in their usefulness.