Napkin Folding The Catamaran A smaller napkin may be used for this fold and it works equally well with linen or paper. Start by folding the napkin in half diagonally. With the base of the triangle nearest you, roll the base up towards the top of the triangle. Roll as tightly as you can and stop rolling approximately 6.5 cm (2 ? in) from the top point. Fold the napkin in half with the rolled edges inwards and arrange the boat on a plate with the edge extending over the rim.