Foam cutting in the shape of a cylinder. You can choose a solid or hollow cylinder, the price is the same.
The minimum diameter of the cylinders must be 10 cm, with the possibility of length up to 2 meters or beyond without limit thanks to gluing.
For a bolster or armrest, choose a very low density because from 15-20 cm in diameter, a 35 kilo foam is very firm for a headrest or armrest. Choose a density of HR28 kilos.