I bought this cap to be able to use my ipod in the water without having to readjust the earphones all the time and it works, but i used it without the earphones as well and it keeps 90% of the water out of my ears which is great.
It could have been better if the ear pockets were a little bigger.

I use this for simple lap swimming and now .  It certainly saves my ears from the previous pain I was experiencing.

This ear cap works fairly well. Some water does eventually leak in if it's not positioned just right, but overall I am satisfied. I don't like to stuff anything into my ears for sealing, so this is the only option I have found to work. Be careful putting it on or you will snap your ears with a painful crack. Pull it way down. It seems do be quite durable. I haven't ripped it in several months of twice weekly rough use. Still not the perfect mousetrap though. I haven't found any product similar to it that is totally leakproof. The price is right.

i was skeptical, but this actually keeps water out of your ears!!
the material it's made of doesn't seem as thick as others so i'm not sure of the lifetime comparability, but other caps tended to slip up on my head and i had a terrible time getting the water out of my ears and so it's worth it!
very comfortable, doesn't pull hair.

I bought this cap mainly because I wanted to cover my ears to prevent ear ache.  This cap is well suited for that purpose and gives a comfortable fit.  After some usage, however, I realized that I must not fully cover my ears because it creates too much pressure on my ears.  As a result, I needed to leave a little of my ears uncovered.

I love my cap!  It isn't perfect because some water still gets in my ears but I'm not complaining.  A lot less water is getting in my ears.  It is a very thin cap which is nice because I can easily pull it over my long hair.