I chose a 7 1/4 hat size and it's a bit big but I never intended to ride it without a helmet. If I hadn't put the helmet on, it probably would have come off. But it works great under a helmet. My helmet doesn't have a visor and I wanted something other than sunglasses from the sun. I live in So. Fla and the summer sun is cruel. Also replaces the headband I was wearing. I use it every time I drive and I never know it's there. Worth buying.
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