I had my first pair for 4 years.  The only reason they gave out is because an end got snagged on something when I had it off the glasses, and I yanked it without checking first.  I prefer these over the brands that have a little ball or clip behind your head to adjust the length.  The ball is always getting snagged on my hair, collar, car seat... This strap is pretty long and you can't change it.  Perfect for me, but beware if you want something adjustable.