This Exos spinal / Back support is the Form II 637 DJO LLC. It is adjustable...tighten by turning a knob.**see picture**. It has a hook and loop closure which allows to tighten also. It is a size Small/Medium
Be aware I have made it so you can choose your shipping preference. Whether it be FEDex, UPS or United States Postal Service (USPS).
Also be aware that FedEx and UPS do not deliver to PO Boxes