This Boneyparts Sero Pressure Cushion features a cut out section that has been specially designed to relieve pressure around the Ischial Tuberosity (sitting bones) area.Made from a high-quality, dense foam, this cushion\'s textured surface ensures even weight distribution while also allowing air to circulate. The foam is both supportive and soft, giving a high level of performance and dependable durability. Suitable for use with chairs or wheelchairs, and ideal for use in the home, office or when travelling, the Boneyparts Sero Pressure Cushion comes with a zip cover that is hand washable.