Manta Sleep Mask

Manta Sleep Mask achieves true 100% blackout with zero eye pressure using adjustable modular eye cups that prevent light leaks—outperforms #8's pillow for blocking disruptive light. It fits side sleepers without shifting, unlike standard masks that press on eyelids, and costs only $35, making it 60% cheaper than the average sleep mask. This yields the highest ROI for dark room optimization.