$100 million. The world's largest inflatable castle, The Big Bounce America, was certified in 2018 at . It included multiple zones, such as ball pits, a slide, inflatable forests, a basketball court, and a DJ booth. It was designed as an inflatable theme park for all ages, and toured the United States in the summer of 2019 as a traveling festival. With adult play a growing trend, bouncy castle rentals have also seen increased popularity at weddings. Inflatable bouncy houses, slides, pools, and other large outdoor toys for retail home use became more popular in the summer of 2020 due to the COVID-19 pandemic, providing a means for parents to entertain their children while maintaining social distancing. With schools and daycares closed, parents bought inflatables to occupy their children while conducting remote work. Construction The surfaces are typically composed of thick, strong PVC or vinyl and nylon, and the castle is inflated using an electric or petrol-powered blower. The principle is one of constant leakage, meaning small punctures are not a problem – a medium-size "bouncy castle" requires a fan with a mechanical output of about two horsepower (about 1.5 kW) and consumes around 2 kW of electrical power, allowing for the efficiency of the motor. UK and Australian bouncy castles have specifications calling for fully inflated walls on three sides with an open front and foam "crash mats" to catch children who may jump or fall out of the structure. Modern moonwalks in the US are typically supported by inflatable columns and enclosed with netting. The netting allows for supervision as adults can see in from all sides. Another type of home-use inflatable has evolved, with a blower pumping in air continuously. Pores in the seams and material allow air to escape as children play, while the blower continues to inflate the unit. This category has emerged as a response to parents who wish to buy an inflatable for home use. Standards In 2005, the most stringent standards in the construction of an inflatable amusement were adopted nationally in Australia, forming Federal Standard AS3533.4. This was a landmark safety standard bringing the toughest design/construction/operation standards to the inflatable industry of Australia. In 2006 the European Union (EU) followed and introduced similar standards throughout EU called EN14960:2006 which was then updated in 2013 to EN14960:2013. While bouncy castle manufacturers adhere to voluntary standards, no national safety standards exist in the