Single Monk, Double Monk & More Traditionally, the single monk strap was the only shoe until the double monk strap appeared. Some designers have adopted unusual variations with three or more straps with the popularity of two buckled shoes. Really, the three or more strapped shoes are probably nothing more than a short-lived fashion that will disappear in a couple of years. If you want to invest in a sustainable wardrobe that can be worn for 10 years without looking dated, you can go with a single monk strap or a double monk strap.