Dark gray clogs/sabots made of wool felt. - Brand: BIRKENSTOCK - Color: Dark Gray - Material: Wool felt - Style: Clogs/Sabots - Insole: Leather - Size: 36 (23-23.5 cm) Used as room shoes for about six months. Please consider purchasing if you understand that this is a used item. Among the many BIRKENSTOCK models, the Amsterdam was developed to be comfortable to wear indoors. The upper, made of thick wool felt, keeps your feet warm and feels good against the skin, making it comfortable to wear even barefoot. They are slip-on type that can be easily taken on and off, and can be worn with socks or tights in the fall and winter, and barefoot in the spring and summer. You can wear them throughout the year. The EVA used for the sole material is light and processed to prevent scratching of the flooring, so you can use them indoors with peace of mind.