The fund offers exposure to large-,mid-, and small-cap Canadian firms with favorable ESG traits relative to their sector peers. Exposure is gained through holding other iShares ETFs. Selection of the underlying portfolio starts with the MSCI Canada IMI (parent index), calculating the size of each companys exposure to key ESG issues based on the companys business segment and geographic risk. The extent to which companies have developed robust strategies and programs to manage sector-specific ESG risks and opportunities are also considered to calculate an overall ESG score. Companies are rated and ranked based on peer ESG scores. Firms must meet a minimum ESG score in order to be included in the index. The portfolio is rebalanced quarterly.