The size of the BlissTrends donut pillow is 17.4 "x 13.39" x 2.64 ". The surface layer is made of comfortable and breathable fabric, and the core is memory foam. The memory cotton inner core has enough support and resilience, which can make you more comfortable and will maintain shape even after many uses.. BlissTrends seat cushion can bring you comfort that ordinary cushion cannot provide, and take care of your body with even more care. The BlissTrends donut seat cushion shape with ergonomic "U" shaped incisions, use to reduce hip pressure, effectively reduce tailbone pressure, thereby reducing hemorrhoid pain, relieve the discomfort caused by sedentary. Ideal for pregnant women, post-operative rehabilitation, office workers and other people.