Medium gray slippers made of soft knit material, slip-on style for comfortable wear. - Color: Medium Gray - Size: 22-23 - Material: Knit material Thank you for viewing. I received these as a gift, but I won't be using them. I think they are soft and warm. Gray slippers with memory foam, machine washable for easy care. I recommend these to those looking for Sodopac Airplum. They are warm because they are lined with boa.