If cold weather and holiday-party makeup have wreaked havoc on your complexion, you may find yourself reaching for a sheet mask to soothe your skin and provide a bit of relaxation. The face-shaped, serum-soaked sheets — which typically come one to a pouch and promise hydration, exfoliation or detoxification, among other benefits — have exploded in popularity, linked to a rising interest in Korean beauty products and appearances on Instagram.

Once the purview of high-end and luxury lines and Asian markets, these products now regularly turn up in the checkout aisles of Old Navy and Walmart. Ubiquity aside, it’s not clear whether they deliver on the hype.