Light and airy, the headmaster cervical collar is covered in a soft, washable fabric and can be easily formed by hand to fit snugly under the chin. Made with low heat retention materials for added comfort, users are able to wear the headmaster cervical collar for long periods of time while benfeiting from the firm support.Buy your haedmaster cervical collar today from activeforever! Hwadmaster cervical collar child 3 inch gray health equipment headmaster cervical collar child 3 inch gray. Headmaster cervical collar features cool and comfortable low heat retention easy to put on and remove low profile, unobtrusive appearance firm support for the head easy to keep clean provides good access to a tracheal tube, if needed ideal for als, ms, arthritis, or motoneuron disease patients headmaster cervical collar specifications materials spring steele core, covered in plastic tubing, then foam, then a soft, washable fabric contains latex how to determine correct size with a ruler or measuring tape, begin measuring from the center of the chin to the corner of the mandible, where the jaw starts curving around to the ear. OHw to shape the headmaster cervical collar 1.