Made of water repellent nylon fabric, Water & wind proof. The inner faux fur lining, extra warm and unbelievable smooth touch feelings, effective against cold weather and comfortable to wear. The earflaps on either side of the hat can be buttoned up and worn, which is very convenient and practical. The back of the hat has an adjustment belt design, which can adjust the tightness according to the personal head circumference: 55cm-59cm (21.6″-23.2″). One size fits most.