tightly, no leaking and does not leave rings around the eyes after swim. takes a little adjusting of course to get the no-leak fit, then you are good to go.
i have only used these twice. they looked like just the thing i needed and worked well the first time i used them. the second swim did not go as well. i had off and on leakage for 2/3 of my 50 minute lap swim. hope next time is better. 