This is an Exos FORM II 637 back brace. It provides a high degree of spinal support and relief for various indications, including acute lower back pain and post-operative support. The brace features a modular, step-up/step-down design for use throughout rehabilitation and recovery. It utilizes the BOA Fit System for easy adjustment and a secure fit. It offers superior sagittal and coronal control and support from the T9 to S1 vertebrae. Sizing is semi-universal, available in S/M (28-50 in) and L/XL (51-61 in) circumference options.