Designed to provide broad exposure to the Industrials ETFs category of the market, the SPDR S&P Aerospace & Defense ETF (XAR) is a smart beta exchange traded fund launched on 09/28/2011.What Are Smart Beta ETFs?The ETF industry has traditionally been dominated by products based on market capitalization weighted indexes that are designed to represent the market or a particular segment of the market.Market cap weighted indexes offer a low-cost, convenient, and transparent way of replicating market returns, an ...