SetWear Smart Back Belt (Large, Waist Size 34-38″) features a oversized buckle that allows for quick adjustment and a secure fit. 3D shaped lumbar wedge fits and supports your lower back to allowing it to assume a natural position. The soft shaped pad provides the perfect lumbar support to take strain off of your back, improve posture and prevent accidents while moving or lifting. Revolutionary BOA tightening system provides instant adjustment and super secure fitting. The BOA knob uses internal 3:1 gearing so it does all the work and provides the ultimate support to your back.