Disclaimer: this review is being written for those who are considering these retainers and wear behind-the-ear hearing aids. I bought a package. I am sure they are well made and work well, but they caused a constant feedback from my aids so I had to discontinue them immediately.

I purchased "TORTUGA STRAPS BRAIDZ Adjustable Glasses Strap" which are much stiffer, but they solved my aid problem and work well.