It depends on the level of your hearing loss.
If you have mild hearing loss then these are fine. But if you have a severe loss, then these will not be suitable.
As LadyAlex says, do check out the NHS range and ensure your hearing is tested first.
If by invisible you mean the earplug type, my husband uses them and is happy with them. Definitely worth getting them. One of us might have throttled the other if he hadn’t got them.