I have thick and coarse hair so these elastics definitely did the job holding them together.
None of them snapped on me yet and I have only used one for the past week.
I have noticed, however, that the spiky nubs comes off every after use so I'm trying to only use them to the gym where it can be such a hassle to keep tying my hair over and over again.

I think there are better valued and and cling-on hair ties. This doesn't snag on my hair and does the job but not something I would purchase.