My husband and I are a bit on the "larger" side, if you catch my drift. I've never had a problem on any of the Disney rides, but I've heard many of the Universal rides are a little "snug". A woman on a board mentioned getting wedged in Rip Saw Falls and having to be hauled out. I don't know how big she is compared to me, but I want to avoid any potential for humiliation.... At Seaworld I rode Atlantis, but was afraid to try Kraken after hubby reported seeing a big woman try and not be able to buckle and have to get off. *sigh*