The specs are very limited but here's the thing - the neck opening is only about 20.5 inches on the inside circumference. I'm a tall male, 6'4", with a neck between 17.5" and 18". This is very comfortable for me, not restrictive at all and provides an extra level of security that is easy to use. These neck braces are starting to go up in price and I'm sure they're good but for comfort and quality this item I'm very happy Thick neck guys don't worry.
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