Deluxe Clavicle Support & Posture Corrector, Pro-Lite by FLA
Information as Provided by the Manufacturer, FLA Orthopedics:

Features

 Fibromyalgia
Deluxe Clavicle Support Size Chart
Measure circumference around upper chest
Product # Size Chest Circumference
76233-00 X-Small 19.75" - 25.5"
76233-01 Small 25.5" - 31.5"
76233-02 Medium 31.5" - 37.375"
76233-03 Large 37.375" - 43.25"
76233-04 X-Large 43.25" - 49.25"