White Labs WLP090 San Diego Super Yeast is a super clean, super-fast fermenting yeast strain. It is a low ester-producing strain that results in a balanced, neutral flavor and aroma profile. This liquid yeast is alcohol-tolerant and very versatile for a wide variety of styles. White Labs yeast is world-renowned for quality and innovation, certified kosher, and subject to thorough quality analysis before being packaged. This yeast comes packaged in White Labs' PurePitch packaging using the revolutionary FlexCell process, which creates yeast that has never been transferred or exposed to the environment. The PurePitch packaging is a recyclable, flexible material that allows for increased breathability, reducing the chance of gas buildup and maintaining the optimal environment for yeast.