This product is great. I suffer from lower back problems from years of carrying an asymmetric duty belt, and now sitting for long periods of time puts a lot of strain on my lower back. This cushion not only stays on my chair perfectly, it helps my back immensely. I recommend this item to anyone who has lower back issues, and sits on an office chair for extended periods of time. Also the customer service appears to be fantastic, I received two emails asking for feedback on their product and reiterating the lifetime guarantee offered. I am very impressed with this product and with the vendor. I would definitely purchase from this vendor again. ..More