Available in standard foam (cream) and memory foam (blue). Sleeping with your spine in alignment, will reduce neck and back pain as well as headaches. self-adjusting pillow has a top core layer and two optional removable layers that can be removed or added to suit you. 1. Top core layer (9.5cm - 3 ¾") 2. Removable layer (3.5cm - 1 ¼") 3. Removable base layer ( 2cm - 1") A total thickness of 15cm - 6" can be achieved for side sleepers that need more shoulder support. Pillow Features as standard: Ear recess for side sleepers (reduced ear sore-ness). Contours on pillows surface for improved ventilation. Groove for shoulders when on back and side (for optimal support). Includes stretch, polycotton, removable cover (that fits all three layers). Recommended for use inside a normal pillow case.