Blackout quality
Winner: Manta SleepManta's design gives total blackout — you can open your eyes inside the mask and see nothing. The hollow eye cups create a seal that no contour mask can match. Alaska Bear is very good (95%+ blackout) but not total — thin light strips can leak around the nose.
For light sleepers who wake at any dawn light, Manta's difference is worth the $22 premium. For occasional use, Alaska Bear's blackout is plenty.

