This sheet mask immerses your skin in intense hydration with Pitera, a blend of vitamins, amino acids, minerals, and organic acids that work together to allow the skin’s natural surface rejuvenation process to function at its prime, enhancing the renewal of the skin’s outer layer. This sheet mask immerses your skin in intense hydration with Pitera, a blend of vitamins, amino acids, minerals, and organic acids that work together to allow the skin’s natural surface rejuvenation process to function at its prime, enhancing the renewal of the skin’s outer layer. After SK-II scientists observed the soft and youthful hands of aged sake brewers, they spent over five years isolating the single yeast strain that held the secret to soft, clear skin. With that, they developed their signature ingredient "Pitera" - a clear liquid rich in vitamins, amino acids, minerals, and organic acids derived from a controlled natural fermentation process.