I was concerned they wouldn't fit, but they went in without a hitch in both ears, and the ears don't feel fatigued. The environment is audible, though in my situation it is not crucial (it is preferable to regulate what is going on than to entirely block it out), and it might cause someone trouble. When I firmly put the headphones into my ear, all outside noise is fully muffled, but you won't walk that way.
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