The height of your chair matters! My chair was average and the edges of the circles didn't cover the entire screen. I've done my best to adapt my computer to the chair and nothing has changed. I bought a large size. The material isn't thick, but it worked. Another thing I didn't like is that it's too heavy and not balanced so the screen can and does fall off when you move your chair. If it was bigger and didn't fall over I would keep it. The price and quality were good compared to other products.
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