It has two ties on the back. Fasten the ties to keep the chair pad steady and prevent it from sliding in any direction. Precise stitching ensures the cushion is smooth and even, with a three-dimensional shape and good elasticity. It’s suitable for all people, absorbing upper body pressure and keeping the tailbone relaxed. The cushion can be used in offices, dining rooms, kitchens, on floors, tatami mats, bay windows, and in cars. Additionally, it is also ideal for outdoor dining and picnics. Made from polyester fiber material, measuring 15.7*15.7 inches, this custom square seat covers chair summer mat cushion pads with ties.