Memory Foam Pillow Insert (foam block). The main feature of this pillow is the way that it molds itself so well to the shape of your neck, keeping it in constant contact with the pillow and keeping your spine straight. This prevents muscular pressure and neck problems. It is the perfect pillow for a healthy and peaceful rest. Both fabric and filling are HYPOALLERGENIC but not DUST MITE-PROOF. The exterior cover is machine washable at a maximum of 30ºC. The insert is not washable