I've tried both the Hyaluronic Acid and Snail varieties. First of all, I really like that these masks include emulsion-type masks (such as Snail), which are generally a little more nourishing in cold weather. Both masks last for 30-35 minutes, although the Snail dries up a little quicker, and result in hydration and an even skin tone. I found that in both cases, leftover mask essence absorbed into the skin very quickly. These aren't perfect masks, but for about $1 a piece, you really can't go wrong.