U-shaped round cushion made of breathable mesh material. gellight3D fit cushion. It's about 45 cm wide, 40 cm long, and 7.5 cm high. I've used it for 4 months. Purchased around September of last year. It has been disinfected with alcohol, and the cover can be removed and washed. - Type: Round cushion - Color: Black/Beige - Shape: U-shaped - Features: Breathable mesh material - Size: Standard size I have other items for sale, so please comment before purchasing.