The underlying index is designed to measure the performance of large- and mid-capitalization U. S. equity securities that reflect the performance of a minimum volatility strategy and, relative to the MSCI USA Index, have higher favorable ESG characteristics and lower carbon exposure. The fund generally will invest at least 90% of its assets in the component securities of the underlying index and may invest up to 10% of its assets in certain futures, options and swap contracts, cash and cash equivalents.