Whether sitting or lying, make sure to recline from the waist up to ensure complete support. Duration of use varies according to individual needs. The composition is made of high resilience polyurethane foam (velva), designed to ensure stability of the cushion. With a comfort layer of high density, gel infused viscoelastic foam (memory foam) included. Easily carried or folded. Most Supportive for the back/shoulders/trapezes. Measures 24Wx28Lx9.5H 18ºA. 3 Layered 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.