I've been looking for glasses that are long enough not to slip off my glasses. I tried different styles and they were all either too short or slipped off the frame too easily. This is by far the best I've found. Longer than most and VERY secure to glasses. The rubber ends have a small slot through which the frame slides. It takes a little effort as they are tight but that's what you need. I suspect there are some very wide ended frames that may not fit, although I have had success with very wide ended frames which I consider frames. I've been using it for a few months now without a single "disconnect" from the framework. Good product. I will look no further as these are my glass holders now.
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