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.

I find these earplugs do a good job.  Some have complained that they don't work well.  Perhaps I am more persistent in seating them than most, but they work better for me than rubber or plastic plugs.  It's important to keep the ear canal as free of wax as possible, because the presence of wax interferes with the seal.  However, even with regular and thorough cleaning of the ear canals, preferably just before putting the plugs in, some wax gets absorbed by the silicone, and I would recommend changing to fresh plugs after 25 long swims or so, or let us say after 25 - 30 hours of swimming.