United kingdom and Australian bouncy castles have requirements calling for absolutely inflated walls on three sides by having an open up front and foam "crash mats" to capture small children who may perhaps soar or drop https://www.evernote.com/shard/s652/client/snv?isnewsnv=true¬eGuid=5cb31978-5147-eef4-f31e-92cb46acba34¬eKey=0560b6f57f341a4bc3c20adabdaf4a18&sn=https%3A%2F%2Fwww.evernote.com%2Fshard%2Fs652%2Fsh%2F5cb31978-5147-eef4-f31e-92cb46acba34%2F0560b6f57f341a4bc3c20adabdaf4a18&title=Jump%2Band%2BSlide%2BAtlanta%2BBounce%2BHouses