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 bought a large, because I am a medium and the reviews said it runs a bit small. I should have brought an extra large. The size runs tiny! If you want to purchase this buy a size two bigger than your normal size.