Comfortably padded and easy to fit, the Headmaster Collar is available in six different sizes ranging from infant to large adult.This model is designed to fit younger patients with a chin-to-jaw measurement of 9cm (3.5\"). It helps to keep the head in the correct position but it is also flexible so it will allow for movement of the neck, both in extension and flexion. It attaches securely around the neck using a soft, adjustable strap, leaving the front open. Consequently, it can be used in conjunction with a tracheal tube if required.