What is the best sleep mask for side sleepers?

Across the reviewers we read, contoured 3D masks with deep eye cups dominate side-sleeper recommendations because they keep fabric off the eyelids when a pillow presses against the face. The MZOO and YIVIEW contoured masks are the most consistently cited budget picks; the Manta Pro is the consensus premium choice for side sleepers, though some r/sleep posters note that even contoured masks can break the blackout seal when the pillow shifts the mask sideways.