Size 4 has a collar height of 12 cm. The product information describes it as intended for adults who need a higher fit around the neck. This makes it different from smaller collar sizes, which have a lower height and suit people with a shorter neck or a different adjustment need.
The right height matters because the collar should maintain its position without pressing too hard or feeling too loose. When you put it on, the front part should sit comfortably under the chin, and the back part should lie against the neck without gaps that let the head drop forward or sideways. You should not have to strain your neck to keep it in place.
Here are a few practical points to check:
- The collar stays in a stable position when you turn your head; it does not slide up or down.
- You can open and close your mouth, swallow and speak without feeling choked.
- There are no painful pressure points, red marks that stay after removal, or a feeling of numbness.
- The collar does not feel loose enough to allow full free movement of the neck.
If you are not sure whether a 12 cm height is suitable, ask a pharmacist or another qualified professional to check the collar on you. Correct size and fit are especially important for safe use.