Review on Yodo Flip-Up Clip-On Polarized Sunglasses For Men And Women - Ideal For Driving, Fishing, And Outdoor Sports, Fits Over Prescription Glasses by Larry Breeze

These clip-ons work well but the low price is a hint that they do not last a long time. The clips fail after about 6-12 months of frequent use, and the tiny rubber tips sometimes fall off. So they are fairly inexpensive but also rather disposable, which may be acceptable if you don't mind sending yet more plastic stuff to the landfill or incinerator. My advice? Buy 2 so you will have an extra one ready when the one you are using dies.