The Visco sponge with microscopic memory cells, sensitive to heat and weight, takes on the shape of the body and adapts perfectly to the body. Visco is a material that has the ability to take shape with heat. When you put your head on the visco pillow, the pillow takes shape and ensures equal pressure on each point. The air circulation is great because it is made of visco material with open cells. It allows for total relaxation of neck and shoulder muscles, ideal for people with cervical hernias and discomfort.