Simply align the highest side of the pillow with the neck. This section is thicker and more flexible whereas the portion supporting the head includes a high density reinforcement to maintain the head correctly aligned with the body. A space to insert the shoulder reduces its tensions. Although the thickness, proportions and reinforcement of the pillow favors sleeping on your side, the Somnia 04’’ may be used for sleeping in another position, if you are comfortable. The composition is made of high density, gel infused miscoelastic memory foam, designed to ensure stability of the cushion. Easily carried or folded. Most Supportive for the cervical/head. Measures 22Wx13Lx04H. Bamboo viscose removable cover is antibacterial, hypoallergenic and breathes/absorbs humidity. Machine washable in cold water. Lay flat to dry. No ironing. No bleach. Additional covers are available.