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 analyses reviews to verify trustworthiness.
Needs to be filled with water before first use. Once filled the powder dissolves in the water and turns it into a gel like substance. Be careful not to overfill. It solidifies upon freezing. Great product overall. Keep in freezer when not using.