The Surf Cushion is designed to fit your favorite portable work desk, The Surf (sold separately). Offering 1.5" of padded comfort during seated activities, the cushion features a built-in sleeve easily slides the cushion onto The Surf Desk seat pan. Designed for everyday use in preschools, classrooms and perfect for home, The Surf portable lap desk is an innovative, all-in-one design that ensures that you have a surface for your laptop or notebook and a seat wherever you need it. Providing flexible seating allows students to quickly and easily pair up, work in small groups, or discuss as a whole. The cushion foam core is covered in a coated oxford fabric and finished with a non-slip base for added stability. Take the classroom indoors and out with the Surf Storage Cart that can hold 10 or 30 Surf Desks (sold separately). The Surf Cushion is GREENGUARD [GOLD] Certified for low VOCs, CPSIA compliant and adhere to CAL TB 117 requirements. Constructed with certified flexible polyurethane foams that meet CertiPUR-US program standards.