Made of soft, polyurethane foam. One size fits most. Velcro tabs for easy secure and closure. Provides comfortable neck support and reduces head and cervical vertebrae movement. Promotes proper healing while preventing additional injury. Works great for fractures, pinched nerves, herniated discs, muscle strains, and sprains. Ribbed stockinette cover promotes air circulation, reduces perspiration and heat build up. Extra stockinette cover is removable for easy cleaning.