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This wasn't what I expected as a breathable mounth gaurd. For one it was not a good fit when formed the mouth gaurd and it was still stiff during forming. Maybe I should have let it sit in the boiling water longer but I followed the directions and pulled it when the time ran out. When it was formed the "breathable" part of the mouth gaurd was closed shut when i bit down on it. Secondly the mouth gaurd is a bit expensive for a two toned bogus fit.