The two other types of kayaks available to consumers are the inflatable and the foldable kayak. The inflatable is also called a “sit-on-top”. It is made out of plastic and is often the type found at all-inclusive resorts or other vacation properties. The foldable kayak is made of lightweight fabric and literally folds down to the size of a large suitcase. Both of these kayaks are considered specialty kayaks and are not something Calm Seas wants to get into.