The present disclosure features inflatable kayaks that have a non-planar hull bottom surface. The kayaks may include an inflatable, tubular body having a bow, a stern and a midsection, wherein opposed side tubes of the midsection define an open central seating area having a predetermined width when the tubular body is inflated; and a hull bottom fabric joined to a lower surface of the body outside of a periphery of the seating area, the hull bottom fabric having a width that is greater than the width of the central seating area such that the hull bottom fabric is not tensioned between the side tubes, and the hull bottom fabric being joined to the side tubes outboard of a vertical center line of the side tubes.