NeoCell sponges are made of open-cell foam. The sponges are made of the top-quality foam with a higher density that reduces softening of the foam when they are subjected to a significant load. This is caused by the special construction of open cells that cause heat reduction when working. They also help to control the heat, ensuring drainage of excess heat when working on the surface being varnished. The heat runs to the centre then it is dispersed to the foam cells, which ensures longer usage of the sponge.