Product details say good for a sun shelf up to 12 inches but the front part still floats unless you’re sitting in it. Also, I tried to cancel the order before it even shipped because it was taking far longer to ship than I was quoted. Seller denied my request. Then they placed my order again (not by my request) because the first order never came). Now that it has finally arrived a month later, it doesn’t even work as intended. So disappointed.