Provides comfort and helps support stiff and injured neck. Intended use: When used as prescribed by your physician, pinched nerves or tightness in neck, comfort after a whiplash injury. Adjustable in both circumference and height for customized fit. Comfortable for day or night use. Breathable material. Sizing: 11.0-20.0 in. (27.9-50.8 cm) neck circumference, 2.5-5.0 (6.35-12.7 cm) height of neck.