Very short so you can wear your glasses while exercising. It's not good to put on and take off reading glasses during, say, an assignment, at least for me. The strap pulled my hair down the sides where the strap catches my arms. Now I have a lot of broken strands of hair on the sides of my head and I only wore it once for an hour or so and then I had to throw it away. Maybe better for a man with short hair.
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