Our kids go swimming in the pool pretty much every single day from April through October, as well as a few days a week in March and November, when the water is almost too cold. By "almost too cold" I mean 70 degrees, which is my threshold for letting them go swimming.
All that chlorine in the water was really doing a number on the girls' hair this year. Miriam loves jumping in and diving underwater, so her hair was getting drenched every time she went swimming. Her hair became dry and brittle, and the ends were feeling like plastic doll hair - yikes!
I found these cute little swim caps on Amazon, and must say they work great! Only the hair around the very edges of the cap gets a little damp during swimming now, no matter how wildly the girls play in the pool. They go on pretty easily, though it helps that I braid their hair first. At age 7, with hair all the way down to her hips, this swim cap still fits Miriam well, though I doubt it will still work next year.
The girls also came up with a fun little game, "The three little fishes and the big bad shark." The big bad shark being one of their brothers chasing them around the pool.
No affiliate links or anything - just wanted to say these swim caps are cute and very good at keeping the girls' hair dry. :)