The tatami for kempo does not need as much thickness as other disciplines in which the projections are worked. That's why it's lighter and more economical.
Tatami boards made of EVA (etylhene, vinyl and acetate), with reversible puzzle system. It's waterproof resistant, antifungal, antibacterial,
Tatami boards made of closed cells of polyethylene in monodensity, with reversible puzzle system. The surface simulates the traditional Japanese