The Kulu a half-slice riverrunner with a play hull. It is pretty fast for its size, very maneuverable, and super easy to roll. My son (aged 11-12 at the time) paddled the prototype for a year-and-a-half, and it has proven to be an awesome little kayak.
When designing a kayak on CAD, it is sometimes difficult to hit the targeted weight range exactly, even when making a prototype to test. The Kulu was designed for the 30-60kg (65-130 lb) weight range. I took my children to the water to check the accuracy of my design was.My estimate turned out to be spot-on. My daughter weighed 45kg (100lb) and my son weighed 57kg (125 lb) and the Kulu performed as designed.