XYLG attempts to provide the best of two worlds, growth and yield. The fund holds the stocks of the S&P 500 Index and writes one-month, at-the-money Index call options on half of the portfolio value. The call options are held through expiration, either expiring or settling in cash. The fund looks to earn some premium income from half of the portfolio while allowing the other half upside potential. Holding the various positions and writing index call options inside an ETF wrapper is a more efficient way to access the strategy. The strategy should reduce volatility and help generate some income, compared to the index itself, but it also places a drag on the overall upside potential.