(Bloomberg) -- As wild stock market swings fray investor nerves, ETFs promising a measure of calm are, not surprisingly, gaining adherents. Such low-volatility ETFs offer a way to stay in the market while sidestepping the beating everyone else is getting.

About $2.3 billion has flowed into these ETFs so far this year—a minor miracle, considering that equity ETFs as a whole have seen $23 billion flow out. The bulk of the new money has gone into the $8.1 billion iShares MSCI USA Minimum Volatility ETF (USMV), which aims to be a more sedate version of a U.S. large-cap stock index. The PowerShares S&P 500 Low Volatility Portfolio (SPLV), which simply holds the 100 least-volatile stocks in the Standard & Poor's 500-stock index, has seen $120 million come in to boost assets to $5.5 billion.

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