Carnival's Twister waterslides that are on ships that run into a pool (Fantasy & Holiday class vessels) have a height requirement of 48” or 4 feet. This height is set by the manufacturer. It is set for the safety of the guest using the equipment.

Carnival's Twister waterslides that run off into itself (Destiny, Sprit, Conquest class vessels) have a height requirement of 42’ as they do not have a pool at the bottom to worry about.