The pressure pad in the brace applies targeted pressure to the specific point that provides back pain relief!Helps relieve lower back pain associated with Sciatica!Quick and easy to apply. The Beactive wrap should initially be worn for up to 2 hours at a time. If it remains comfortable, the wrap can be worn for longer periods as needed.Works on either right or left leg! The Beactive wrap fits the calf circumference sizes 12.5 inches to 18 inches measured around the fullest part of the calf. The Beactive wrap is effective when worn on a single leg on the side of the pain.Discreet and easily hidden under clothing.