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General product information only, not medical advice. Choosing and fitting a collar for a person is a clinical decision for a trained professional.
This is a lookup chart for one widely documented rigid collar family, the Aspen cervical collar, using the manufacturer’s own numbers. Other makers size differently, so treat any chart as specific to the product named. For the wider picture see our cervical collar types and sizing guide, the Aspen collar guide and what a cervical collar is.
Cervical collar size chart
Enovis, which owns the Aspen brand, lists these sizes on its Aspen collar product page (checked 2026-11-01). The page gives inches only; centimetre values below are our arithmetic conversions (1 in = 2.54 cm), rounded to 0.1 cm. Aspen Medical Products’ own adult SKUs are shown for cross-reference.
Adult sizes
| Adult size | Front height | Neck circumference | Enovis part no. (collar only) | Enovis part no. (with replacement pads) | Aspen Medical Products no. |
|---|---|---|---|---|---|
| Short | 2.25 in (5.7 cm) | 13-22 in (33.0-55.9 cm) | 79-83283 | 79-83363 | 983108 |
| Regular | 3 in (7.6 cm) | 13-22 in (33.0-55.9 cm) | 79-83285 | 79-83365 | 983110 |
| Tall | 3.75 in (9.5 cm) | 13-22 in (33.0-55.9 cm) | 79-83287 | 79-83367 | 983112 |
| X-Tall | 4.5 in (11.4 cm) | 13-22 in (33.0-55.9 cm) | 79-83288 | 79-83368 | 983114 |
Pediatric sizes
| Pediatric size | Age band | Neck circumference | Enovis part no. |
|---|---|---|---|
| Infant Short | 1-18 months | 8-12 in (20.3-30.5 cm) | 79-83272 |
| Infant Regular | 9-24 months | 11-13 in (27.9-33.0 cm) | 79-83273 |
| Child Tot | 1-3 years | 11.5-14 in (29.2-35.6 cm) | 79-83275 |
| Child Short | 2-5 years | 12-14.5 in (30.5-36.8 cm) | 79-83277 |
| Child Regular | 3-6 years | 13-16 in (33.0-40.6 cm) | 79-83278 |
How to read the cervical collar size chart
In the adult range every size lists the same neck circumference, 13-22 in, so circumference does not tell the sizes apart. What changes is the front height: 2.25, 3, 3.75 or 4.5 in. Height, not neck circumference, is therefore what separates the adult sizes. Pediatric sizes work differently: each lists its own age band and its own circumference range, and the bands overlap (for example Infant Regular 11-13 in and Child Tot 11.5-14 in).
Two part-number systems appear for the adult collar. Enovis numbers each size twice, once for the collar alone and once with replacement pads. Aspen Medical Products lists Short 983108, Regular 983110, Tall 983112 and X-Tall 983114 on its product page. The table pairs the two systems by size name only.
How the maker handles sizing and fit
Aspen publishes an adult and pediatric sizing guide that sets out its own fit method and a printable on-sheet ruler; print it at “Actual Size” so the ruler is accurate. The guide states that proper training in the use of the device should take place before it is applied, and that its directions are guidelines only and not medical recommendations. Selecting and fitting a collar for a person is for a trained professional, using the product’s labelling and instructions for use rather than any chart on this page.
C-collar sizes, measurement and equivalents
Searches for c collar sizes, c-collar sizing, cervical collar measurement or a neck brace size chart usually mean one of two things: the height-based sizes above, or a circumference range. The only equivalent that matters for this collar is inch to centimetre, as the chart shows. Other designs, such as adjustable collars, are fitted by their own instructions for use.
In the United States, cervical orthoses are Class I devices under 21 CFR 890.3490 (FDA product code IQK) (openFDA classification database, checked 2026-11-01). That classification does not set standard sizes; sizes are the manufacturer’s.
Common mix-ups
- Height versus circumference. Adult Aspen sizes share one circumference range; the height differs.
- Adult versus pediatric. Pediatric collars use age bands and smaller circumference ranges, 8-16 in in total.
- Conflicting listings. Some retailer listings give 13-21 in for the Regular adult size, while the manufacturer page says 13-22 in. The manufacturer’s figure is the one used in the chart; the labelling on the product governs.
- Two part numbers for one size. Collar only and with replacement pads are different part numbers of the same size.
Frequently asked questions
What are the standard cervical collar sizes?
There is no single standard. For the Aspen collar, Enovis lists adult Short, Regular, Tall and X-Tall (front heights 2.25, 3, 3.75 and 4.5 in) and five pediatric sizes from Infant Short to Child Regular.
How do I measure for a c collar?
Aspen publishes its own printable sizing guide with an on-sheet ruler, and other makers publish theirs. Fitting is done by someone trained to apply the device, following the product’s instructions for use.
Is a neck brace size chart the same for every brand?
No. Brands differ in how they size, so use the chart from the product you actually have.
Does neck circumference decide the adult size?
Not for Aspen: all four adult sizes list 13-22 in. Height separates them.
Sources
- Enovis, Aspen Collar product page, https://enovis-medtech.eu/en_US/Aspen-Collar-74526.html, checked 2026-11-01.
- Aspen Medical Products, Aspen cervical collar page, https://www.aspenmp.com/collections/all/products/aspenr-cervical-collar, checked 2026-11-01.
- Aspen and Pediatric Collar Sizing Guide (PDF), https://vumc.org/cvicu/sites/default/files/2020-02/aspen-collar-pd-sizing-chart.pdf, checked 2026-11-01.
- FDA openFDA device classification, product code IQK, 21 CFR 890.3490, https://api.fda.gov/device/classification.json?search=product_code:IQK, checked 2026-11-01.
