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In page Cervical collar:

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A range of manufactured rigid collars are also used, usually comprising (a) a firm plastic bi-valved shell secured with Velcro straps and (b) removable padded liners. The also contain a back pad, back panel, front pad, front panel, and chin pad. There are air holes throughout the device to provide ventilation to the area but also to allow access for a tracheostomy if needed. The rigidness is provided by plexiglass in some models. The most frequently prescribed are the Aspen, Malibu, Miami J, and Philadelphia collars. All these can be used with additional chest and head extension pieces to increase stability.[citation needed]