As someone with sensitive, rosacea-prone skin, I often find that some watery sheet masks can cause a stinging sensation. However, this mask's serum seems to be really good! It adheres perfectly to the skin and provides excellent hydration. What's unique is that it comes with a simple plastic-like cover that you place over the mask. This seems to prevent the serum from evaporating, as I noticed that even after 20 minutes, the essence was still there when I removed it. Despite being called a 'steam sheet', I was pleasantly surprised that it didn't feel overly warm - just about skin temperature, which was actually quite nice. After removing the mask and letting the remaining serum absorb, my skin felt wonderfully moisturized with a beautiful glow.