TracCollar is a comfortable traction collar designed for neck pain relief. Elegant, comfortable, portable, TracCollar is a traction device providing superior control and ease of use. This neck traction device is designed for professional and home use. TracCollar can be used when watching TV, using a computer at home or work, standing, sitiing and lying down (with a pillow under the head). Because it is compact and lightweight, it is great for use when traveling, so you do not have to go without neck pain relief on the road. TracCollar provides support like a collar, which aids stability of the cervical spine and the traction is wonderful and relaxing for tense muscles, while the dual action pump regulates traction force to a specific side (left or right) if needed or prescribed. TracCollar is available in 2 sizes. Measure your neck circumference in the middle, or some use their shirt collar size: Regular (Red): 14 to 16 in. (35,5 cm to 40,6 cm) & Large (blue) 16 to 18 in. (40,6 cm to 45,7 cm). If you fall between sizes, choose the large TracCollar size.