Viscoelastic polyfoam , also referred to as memory foam, may be a popular material for mattresses and pillows because it alleviates aches and pains within the sleeper’s most sensitive areas. Memory foam becomes softer when it comes into contact with body heat, allowing it to evolve closely, then recovers its shape when it cools down. Pillows made from memory foam could also be constructed from one piece of froth or crammed with shredded foam. Additionally, some memory foam pillows are raised to elevate the neck and supply better support for sleepers with chronic neck and/or shoulder pain. Memory foam should never be machine washed, but most pillows include removable, washable covers to assist keep the pillow hygienic. Visit for more info- https://www.amazon.com/RONKOFF-Shredded-Adjustable-Hypoallergenic-B...