my kids call them mini ribs.. "cause they are"
Well actualy they aren't. A Rigid Hull Inflatable (RIB) as it says has a rigid hull. These come in all sizes from 2.5m upwards.
A Soft Inflatable Boat does NOT have a rigid hull. It is completely inflatable (often including the floor), okay so the transom is made of wood. Anyway the whole boat will fold up into a bag. These also come in all sizes from about 2m to about 6m.
But they are different beasts.
Keith (official SIB to Orkney record holder) Hart