This Foam Cervical Collar by Rolyan provides non-rigid support and limits mobility. The build of the firm foam collar is designed to relieve pain from neck muscle spasms or “whiplash” injuries. This product is washable and includes medium-firm density foam covered with stockinette. Hook & loop closures allow for quick on and off application, as well as a customized, easy fit. The X-Small size fits neck sizes 2-1/2" x 15", Small fits 3" x 21", Medium fits 3-1/2" x 21", and Large fits 4" x 23-1/2".