Exos Form II 637 Lumbar Support Brace, Small/Medium, 300637-40 DJO Global. EXOS FORM II 637 LSO brace in size S/M. New open bag. The brace is unused and includes the original packaging and instruction manual. Provides adjustable lumbar-sacral support with rigid anterior and posterior panels. Model: 300637-4 Size: Small/Medium Type: Lumbo-Sacral Orthosis (LSO) Condition: New–open bag (never worn) Includes: • EXOS FORM II 637 brace • Original packaging • Instruction manual Features: • Adjustable anterior, posterior & lateral support • Rigid lumbar stability • Lightweight and breathable structure • High-end medical-grade construction