https://www.bubblefootballshop.....co.uk/sports/giant-
Zorb ball have two sections, one ball inside and another outer ball on the outside with a layer between. You can comfortably roll in it downhill inside an orb generally made of transparent plastic. The manufacturers are professionals with skilled workmanship and have they always ensured that whatever they send to the market is safe for the users so you shouldn’t get scared at all rolling downhill inside the zorb ball. It is much more fun.