For cervical spine immobilization and extrication.
Maintain head in neutral position while supporting muscles, bones, ligaments and nerves.

| Size | Suitable Sizing (inch) | Suitable Sizing (cm) |
|---|---|---|
| S | 8 1/2"~12" | 22~31 |
| M | 12"~14 1/2" | 31~37 |
| L | 14"~16 1/2" | 36~42 |
| XL | 16"~19" | 41~48 |