Size: Length x 4 in Width.Firm Foam 2.3 density; 50 compression rating.Hand washable.One-size-fits-most.Offers comfortable support while reducing head and cervical vertebrae movement.Made of firm, Polyurethane Foam.Ribbed stockinet cover promotes air circulation and helps prevent heat buildup and perspiration.Hook and loop adjustment provides a custom fit.Hand washable.Provides a greater degree of immobilization than soft Foam collars.This item is FSA (Flexible Spending Account) eligible.