If you're a beauty, spa, hotel, or eye-care brand evaluating a private-label steam eye mask line, you've probably already noticed two things. First, the category is crowded — Kao's MegRhythm kicked it off back in 2012, and since then everyone from Miniso to Space, Popband, Repose, and Bausch & Lomb has jumped in . Second, the quality spread between "cheap promotional giveaway" and "medical-grade daily driver" is wider than most buyers realize until a claim lands on their desk.