I am an adult and I use these ear plugs.  I used to buy them from Sports Authority for more money.  Swimoutlet has the best prices ever!!  The product is great and the price can't be beat.

These earplugs were not meant for a competitive swimmer.  These are appropriate for a small child who is playing in pool, not a child that is 10 years old or older  that is practicing three to four times a week.  The plugs are not thick enough to provide protection or a seal to keep water out for a child with tubes in his ears.