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/lower back. Measures 15Wx06Lx03H. 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.