The fund tracks an index that invests in US high yield, corporate bonds that have higher ESG ratings(based on MSCI ESG ratings) relative to their peers, and a term to maturity greater than one year. It excludes companies that earn a significant portion of revenues from tobacco, adult entertainment, alcohol, gambling, conventional weapons and civilian firearms, any controversial weapons, significant generation of nuclear power, unconventional oil and gas, and other controversial companies. These bonds must also have a credit rating of BB or higher. Eligible securities are then market-value-weighted within the portfolio and rebalanced on a monthly basis.