Guests whose waistlines are 40” or greater may not be accommodated on the ride and are strongly encouraged to try the test seat provided at the entrance of the attraction to assist guests in determining their ability to ride.

Universal Studios does not have a single "maximum waist size" across all attractions, but many of its high-intensity thrill rides (particularly those in the Harry Potter and Jurassic World lands) use restrictive seating that may not accommodate guests with a waistline over 40 inches (102 cm) or those with large upper bodies. For example, Harry Potter and the Forbidden Journey, Hagrid’s Magical Creatures Motorbike Adventure, and the VelociCoaster have specific safety sensors on the lap bars or over-the-shoulder harnesses that must click into place to a certain depth before the ride can dispatch. To help guests avoid being turned away at the loading platform, Universal provides "Test Seats" at the entrance of nearly every major attraction. These allow you to privately check the fit and see if the restraint indicator turns "green" before you wait in a long queue. Guests who carry their weight in their midsection or thighs may find certain seats (like the "modified seats" in the middle rows of The Incredible Hulk Coaster) more accommodating, as they feature double-buckle harnesses designed for broader body types.