A good sleep mask should make the room feel darker without adding pressure where you do not want it. Fit matters more than complicated features.
Look for adjustable comfort
The strap should hold the mask in place without feeling tight. A contoured shape can leave more room around the eyelids, while a flatter mask may feel lighter to some sleepers.
Check light leakage
Try the mask in your normal sleep position. Small gaps around the nose are common; adjust the strap gradually rather than overtightening it.
Keep it clean
Follow the care label. Allow the mask to dry fully before using it again, and avoid sharing personal sleep accessories.
Use common-sense safety
Test the fit while awake first. Stop using the mask if it causes pain, skin irritation, vision changes, or uncomfortable pressure. A sleep mask is a comfort accessory and is not intended to diagnose or treat a medical condition.