If you have big, curly, lovely fluffy hair this may be difficult. I have used both on my head and I think I have a smaller head than most. Keeps the water out. I don't think I used only one. No allergic reaction which is great. Covered my ears pretty well. It has lasted long for me. I also take care of it. I rinse after a swim in a pool and I let it air dry.Bigger size needed for bigger hair.
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