The following are general guidelines to assist you in determining what size SP Medical Non-Adjustable CPAP Chin Strap would work best for you. Please keep in mind that everyone's head is shaped differently, so these truly are just guidelines.

1. Measure the circumference around the chin to the back of the neck, below the ears. The tape should be horizontal to the floor.
2. If the circumference is less than 21 inches, choose Small.
3. If the circumference is between 21 and 23 inches, choose Medium.
4. If the circumference is greater than 23 inches, choose Large.

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