Reverse camber
Reverse camber refers to the negative camber of the skis. If we put the skis together, they will only touch in the middle. The reverse camber ensures the best buoyancy when riding in powder and easy handling. On a hard surface, they don't have such pressure on the snow and give an unstable impression.
Source: https://snow.cz/clanek/3655-slovnicek-freeridove-lyze