Roho Seat Cushion - LTV Seat Cushion 17" x 19" You ll Love that Valve! The secret to the extraordinary comfort of this Roho Seat Cushion is the valve. The valve on the Roho LTV Seat Cushion lets you customize the seat to your specific comfort level. ROHO Shape Fitting Technology makes the difference. The LTV General Purpose Seat Cushion is made of individual, interconnected air cells that allow air to slowly transfer from chamber to chamber and evenly distribute body weight pressure. Weighing only one pound, the Roho LTV Seat Cushion is lightweight and easy to fold. It can easily be transported from your scooter, to the car or wherever you may need a cushion for use outside of a wheelchair. This is the last car seat, bleacher seat, plane seat, or office chair seat you will ever own. Note this item is not returnable once removed from the manufacturer's sealed packaging.