My son (9 years) has had one of these straps for the past 3 years. We change it 1-2 times a year but he wears it all day, every day, so it wears out a bit after a while. He keeps his glasses firmly on his face (no longer has to pick them up constantly) and is still flexible enough to allow him to take his glasses off his eyes when reading/doing something nearby (doctor's orders) . They also replaced sports glasses, since children's glasses have to be made of safety glass anyway. We love them and will continue to buy them.
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