Wish I'd found these 20y ago
These are so good I'm about to buy a second pair. I bought them to wear under my motorcycle helmet to dull the (annoying) wind noise, having tried many alternatives, unsuccessfully.
These HearPlugs work perfectly - letting 'a little' noise in but not a lot. Sometimes my right ear is is a little fiddly but it only takes a minute. A trick I noticed to get a perfect fit is to wet the plug / ear first (e.g. after a swim they work even better, or use a more 'naturally available' alternative!).
I even keep these on in shops so that annoying loud people are more tolerable :). They're discreet enough to wear in public.
The second pair will be to wear on my bicycle, to stop the wind noise that I find annoying (which gives me ringing ears). I've now used them for about a month and find they dull lorries and loud vehicles to a tolerable level, while I still hear enough to feel safe. YMMV, of course.
Small point to note. As I'm a petite female I expected the smaller size supplied to fit me. I was surprised that the smaller size doesn't fit at all. However, the larger size fits perfectly. So, maybe I'm a small person with big ear canals?