Horrible product
These were a waste of money.  I brought them for my daughters glasses but they didn't stabilize her glasses at all. When I put them on the arms of her glasses and put the glasses on her face, the straps would not stay on her glasses. I could not use them and had to explore other options. The silicone loops are very, very thin that it feels like they will pop if you try to tighten them and they don't tighten up enough to stay in the arms of the glasses. They just slide off.
Rating: 1 stars