The main reason to wear a swim cap is to keep your hair dry.  This cap does not do it and therefore is useless to me.  I dont really even use it for swimming just aqua aerobics!

I'm not happy with this cap because it keeps riding up. Thus, it doesn't keep water out of my ears. It was the wrong choice for my purposes.

Fits very snug on the head, even with a lot of hair. Haven't tried it under water yet, but it is fine for water aerobics.

This cap might work for someone with really long hair, but there's a lot of unfilled "space" in this cap.  I was surprised when I took the cap off after swimming and my hair was almost as wet as if I hadn't worn a cap.  The material it's made from is nice and comfortable... easy to put on and PLENTY of room for hair.  For water aerobics and staying mostly above the water, it would probably work fine.

Don't like it because it does not cover the ears and it keep raising up.

Doesn't fit well and pulls my hair.  Myabe it keeps my hair a bit drier than the regular bubble cap, but nothing keeps my hair really dry.