They do what they're supposed to do, however, if your ears are wet when you first insert the plugs, they don't fit in the ear snuggly/securely. They'll slip/slide out of place.

all the other silicons leaked into my sinus ,this one molds better for me

i use these for my swimming class, they work well

If you pinch the plugs into a cone shape and position them in your ear, they completely block the water and pull out easily. I've used them during triathlons and they work great.

can't get a good seal.

I bought it to use during my swim practice and still could not figure out how to "shape" to my ears. The instructions are not helpful and the product is not easy to use.