It tracks the Bloomberg Global Treasury ex-US Capped Index and holds government bonds from major countries such as Japan, France, and Germany, weighted by market capitalization. Its low correlation with US Treasuries makes it useful for portfolio diversification.

It is suited to investors who want to bet on a weaker US dollar or to diversify their portfolios geographically through global government bonds.

It is a passively managed (index-tracking) ETF launched in 2007 by State Street (SSGA).

It diversifies across the global investment-grade government bond market excluding the US. Because it does not hedge currency exposure, it is structured to earn currency gains when the currencies of the countries it invests in appreciate against the dollar.

• Broad exposure to the global government bond market outside the US
• Currency diversification through an unhedged strategy

Assets under management (AUM) stand at $1.3B, and the expense ratio is 0.35% per year.

Unlike the US Treasury ETFs shown in the table, such as GOVT and SHV, which concentrate solely on dollar assets, BWX broadens its scope to government bonds worldwide and helps offset risks specific to the US market.

Returns show considerable volatility depending on the global interest rate cycle and the direction of the US Dollar Index. As monetary policy divergence among major economies and currency volatility have increased recently, demand for tactical asset allocation into international bonds has been growing.

Inflows aimed at capturing currency gains stand out when the perception spreads that dollar strength has peaked. It also tends to be chosen as a complement to the traditional 60/40 stock-bond portfolio.

It is an efficient way to diversify across currencies and regions through high-quality government bonds from around the world, but investors should be wary of the high volatility that comes with exchange rate movements.

EMB, shown in the table, specializes in emerging market government bonds and comes with higher yields and higher risk. If you want to eliminate currency volatility and invest in international bonds more stably, BNDX is a good alternative, and if you want to focus only on government bonds from developed countries outside the US, you can consider IGOV. VWOB, which invests in emerging market local-currency bonds, is also an option worth considering.

These are the key points to review before investing in BWX. It is advisable to make your decision after fully considering the benefits of international bond investing and the effect of exchange rates on returns.

Foreign government bonds may be less liquid than US Treasuries, and in the event of political instability or an economic crisis in a particular country, there is a risk that both that country's bond prices and its currency value could plunge at the same time.

It is a suitable tool for investors who want to expand a dollar-heavy portfolio to the rest of the world. For experienced investors who can use exchange rate movements as an investment opportunity, it becomes an excellent asset allocation instrument.