The angle that the straps are attached due to the ear openings makes it not line up with your chin and allows it to slide forward even if you pull it extremely tight. This totally defeats the purpose of the chinstrap. I like the ear openings because the strap without the openings is hot.
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Knightsbridge Sleep Solutions anti-snoring chin strap lifts from under the jaw to produce a vertical force. The vertical force works with the natural rotation of the jaw, rather than against it, so a minimum of force is needed.
Minimum force makes for maximum comfort.