Where should the collar be measured to ensure proper sizing?

The correct method to measure the collar for proper sizing is from the trapezius muscle to the jaw. This measurement ensures that the collar sits comfortably and securely around the neck while allowing for adequate movement and support. The trapezius muscle is a prominent feature at the back of the neck, and measuring from there to the jaw helps to accommodate the natural contours of the neck and the position of the jaw. This is crucial for providing both comfort and effectiveness, as a well-fitted collar is necessary for supporting the head and preventing further injury in cases of trauma or other medical situations.

Other measurement options do not accurately reflect the necessary areas for a proper collar fit. For instance, measuring from the base of the skull to mid-back does not account for the alignment required for head and neck injuries. Similarly, measuring from the top of the head to the shoulders skips key anatomical points that dictate proper fit around the neck. Lastly, measuring from the neck to the chin is not sufficient as it does not consider the full span required for proper collar installation.