Normally investing at least 80% of assets in securities of water sustainability companies. Water sustainability companies include those contained in the S&P® Global Water Index or those that, in Fidelity Management & Research Company LLC's (FMR) (the Adviser) opinion, are developing efficiencies, extending the life cycle and/or identifying affordable new technologies to deliver safe, reliable or easily accessible water. Such companies may include but are not limited to companies principally engaged in water resources, water treatment, water distribution and utilities, desalinization or purification facilities, water technologies and analytics, environmental water services and water infrastructure (pumps, valves, meters, pipes), irrigation, water conservation services, and water supply or processing services. For purposes of the fund's policy to normally invest at least 80% of its assets in securities of companies principally engaged in the business activity or activities identified for the fund, Fidelity may consider a company to be principally engaged in the designated business activity or activities based on: (i) the level of a company's assets, income, sales, or profits that are committed to, derived from, or related to the designated business activity or activities, or (ii) whether a third party has given the company an industry or sector classification consistent with the designated business activity or activities. Whether a company is principally engaged in the designated business activity or activities can be determined under any of these factors. Effective December 11, 2025, derivative instruments that provide investment exposure to the investments above or exposure to one or more market risk factors associated with such investments are included in the fund's 80% policy, consistent with the fund's investment policies and limitations with respect to investments in derivatives.   Normally investing primarily in equity securities.Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments.Investing in either "growth" stocks or "value" stocks or both.Investing in securities of domestic and foreign issuers.Employing sustainable investing exclusion criteria to avoid investments in issuers that are directly engaged in, and/or derive significant revenue from, certain industries. Please see "Fund Basics - Investment Details - Sustainable Investing Exclusions" for additional information.