Kayaks could be a stiff hull or inflatable; inflexible kayaks are almost always made from polyethylene, while inflatables are constructed from a PVC product. The majority of people choose a rigid hull, as they are more stable and also more immune to harm. Inflatable kayaks have their advantages, nevertheless: they are much lighter as well as consequently easier to carry (an inflatable kayak is generally regarding the size of a bag when deflated). Inflatable kayaks typically include a pump of some sort, so they could be easily moved to the water and inflated at arrival.
The majority of people, especially beginners, are typically much better off with a firm kayak. Inflatables do have their usages, yet firm hulls are merely more versatile - especially if you intend on going out on the open sea. An inflatable kayak would certainly not be my first option if an interested shark determined to take a test bite from my kayak!