Indications For Use: Post-trauma Herniated Cervical Disc Cervical Spondylitis Post-operative Ra And Oa Cervical Spine * Circumference And Height Adjustable * Permanent Lock On Height Adjustment * Anatomically Shaped Plastazote Foam (not Made With Natural Rubber Latex Non-toxic And Hypoallergenic To Reduce Skin Irritation) Leaving Clearance For Cervical Veins * Total Cervical Arch Support Maintains Neutral Alignment Of The Cervical Spine * Water-resistant For Bathing And Hydro-therapy * Well Ventilated * X-ray And Ct Lucent (mr Conditional) * Conforms To Sizes 2 3 And 4 Of The Original Philadelphia Tracheotomy Collar *