The entire range of kayak models - from inflatables to sit-on-tops and cruising kayaks - is available as two-person craft, whether for recreation or competition.
The two kayakers sit one behind the other, making it necessary to paddle in rhythm to ensure efficiency.
The double kayak allows users of differing experience or ability to paddle together, while avoiding problems of staying together in two single-place craft. On the other hand, the two users must be sure they share kayaking goals and interests, since a double kayak is difficult to use alone.