MODEL 825: Soft Foam Collar - 3 1/2" Height. Contoured design has hook "n pile closure strap. Polyurethane foam is covered with natural cotton stockinette. Soft foam collars provide comfortable support when stabilization of the cervical region is needed. Foam collars are especially convenient for night wear. Use is indicated for relief of muscle tension and/or treatment of minor neck injuries including automobile whiplash. See size chart below. NOTE: Measure your neck circumference and add approximately 3" to determine the proper length needed. Size Height Length Small 3 1/2" 15 1/2"Medium3 1/2"17 1/2"Large3 1/2"19 1/2"X-Large3 1/2"21 1/2"