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.
I opened the packet and looked at the product, never used these types of Mylar Thermal blankets before. I rated a 5 star for light weight and a 3 star for value of money and durability because I’ve not used them yet as I have stored them in my back pack for emergency use. I’ll know more when I’ve used them and can provide a better rate. Hope this helps.