The melting concept is innovating. It is claimed that you can leave it on for 20-40 minutes. On me, after like 10 minutes, it starts to dry out... Nevertheless, it is hydrating enough for those 10 min. Also, this mask sells at Sephora for $9 each. Definitely buy it here.

for my mom  does not use yet   

I bought this for my mom on mother's day, and she really love it. Best price on style korean