How can you tell what size is the right one for you?

Dear customer, There are three styles of our elaborate neck brace, namely comfort version, dual use and enhanced version. They are available in different sizes. Please be sure to measure the neck circumference and neck height and purchase corresponding products to achieve the best effect. Small：Neck circumference 10 1/2"-11 1/2"；Neck height 2 1/2″ & 3 1/2″ Medium：Neck circumference 11 1/2"-13 1/4"；Neck height 3" & 4″ Large：Neck circumference 13 1/4"-16 1/2"；Neck height 3 1/2" & 4″ X-Large：Neck circumference 16 1/2"-18 3/4"；Neck height 3 1/2" & 4″ Best Regards, Velpeau Brace Services

Does this keep your mouth closed at night?

I wear this cervical collar (comfort version) every night to reduce my sleep apnea. Even though I also wear a full face CPAP mask which covers my nose and mouth, if I forget to wear this collar overnight, my AHI (hypopneas per hour) are 15-18 (according to my CPAP machine's sensors), but if I wear this collar, AHI is only about 1-2. The more I tighten the collar, the lower the AHI. This collar keeps my jaw and mouth from gaping wide open, but nothing outside of a vise could completely prevent you from opening your jaw when you are asleep. Believe me, I've tried every style of collar, chin strap (including homemade), and even taping my mouth shut with medical tape. Try any of those things and you will see you can still open your jaw a bit especially if you tilt your head back a little. This collar does reduce it enough to make a big difference in apnea. I found a 4" collar too high (made me bend my head back a little and still wouldn't guarantee a closed mouth. The 3" collar height was right for me. Someday I might try the 3.5".

How many inches wide is this neck brace? 3, 3 1/2 or 4?

Dear customer, There are different sizes available for this neck brace, please carefully measure your neck circumference and neck height before purchasing, and check the size chart on the product page according to the measurement results to choose the correct size. Please be noted that even with the same neck circumference, different neck sizes are for different neck heights. Specific as below: Small 2.5"： Neck circumference 10.5"-11 .5"，Neck Height 2.5" Small 3.5" ： Neck circumference 10.5"-11 .5"，Neck Height 3.5" Medium 3"： Neck circumference 11 1/2"-13 1/4"，Neck Height 3" Medium 4"： Neck circumference 11 1/2"-13 1/4"，Neck Height 4" Large 3.5"： Neck circumference 13 1/4"-16 1/2"，Neck Height 3.5" Large 4″： Neck circumference 13 1/4"-16 1/2"，Neck Height 4" X-Large 3.5"： Neck circumference 16 1/2"-18 3/4"，Neck Height 3.5" X-Large 4"： Neck circumference 16 1/2"-18 3/4"，Neck Height 4" （Measurement method：Measure the neck circumference with a soft ruler around the neck. And the distance from the collarbone to the frontal bone is the neck height. Finally according to the measurement results to choose the right size.） Best Regards, Velpeau Brace Services

Model Number	VP0201-M (Regular Size）
Batteries Required?	No
Batteries Included	No
Material Type(s)	Foam
Target Gender	Unisex
Item model number	VP0201-M (Regular Size）
Package Dimensions	15.75 x 10.74 x 10.67 cm; 140.61 g
ASIN	B072Q9QG68

Velpeau Neck Brace - Foam Cervical Collar - Soft Neck Support Relieves Back Pain and Pressure - Relieves Spinal Pain - Corrects and Stabilizes Spine - Can Be Used During Sleep

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