It took a while to figure out how to use these right. What worked for me was keeping the strap tight and discovering how to maneuver them on and off gracefully (while still tight).I finally got there, but I started out providing a two star review and didn't change it to four stars till I'd played with the product for a day.And I'll probably leave it at four stars because even as tight as it goes, the strap pops my glasses a smidge off my nose if I lean back against a headrest. The manufacturer should allow for a slightly tighter fit.(Though I don't know if a "slightly tighter" fit would still allow me to maneuver them on and off easily while tight.)OK. OK. I'll go to five stars. There's a definite learning curve, but at the end of the day, these straps may be better than the others I've owned.
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