Are contoured 3D eye masks better than flat silk ones?

It depends on what you want. Contoured masks (MZOO, YIVIEW, Manta Pro, Fygrip) keep pressure off the eyes and lashes and tend to block more light, which is why specialist subreddits like r/sleep and r/BuyItForLife favor them for blackout. Flat silk masks (Manta Silk, SECZIPE) are thinner, cooler, and gentler on skin, but reviewers consistently note they let in more light at the nose bridge and can press against the eyes.