Having already had a pair in teal color for 2 years, I also bought one in gray that I found for 35€. These slippers, although a bit expensive, are very warm, lightweight, with a comfortable anatomical insole that can be removed for washing, and most importantly, they have a non-slip sole. Buy your usual size because they will "stretch" as you wear them. I also recommend spraying them with waterproof spray to prevent them from getting dirty, although they can be washed.