Out of the 4 varieties they offer, I tried out the blue 💙 (moisture) and yellow💛 (whitening). There is also pink (elasticity) and green (pore care). The mask sheet is a thick cotton that soaks up the essence and sticks to my face a long time. It’s not the most innovative mask sheet but gets the job done. The fit is similar to most masks, i.e. I have a lot of extra material over the chin area.
There is a lot of essence in each pack, my decompressed dry mask soaks it up with essence to spare. I found the yellow one to be more hydrating than the blue, when I thought it would be the other way around, but lactic acid does contain moisturizing properties. Apart from that, no other noticeable effect, but, my no.1 goal for sheet masks is hydration, so these delivered.