These economy foam cervical collars are covered in stockinette and are secured with a touch and close fastening. They offer support to the neck and are ideal for long-term use or as a night collar.Available in four sizes, simply measure the circumference of the neck and select accordingly.Small - 3?x 17 (76mm x 495mm)Medium - 3 ? x 19 ? (89mm x 495mm)Large - 4 x 21 ? (102mm x 546mm)