To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.
I am so grateful to have discovered this product. They bring such relief to my back. They only problem is that the new sticky stuff design doesn't allow it to hold onto my back as they used to. Maybe I just had one bad box. Other than that, I highly recommend this product.