ProStyle Hinged Knee Support X Large 17 19 Jobst Ultrasheer 15 20 Pntyhse Adaptive Feedback Cancellation (AFC) The Otoscope Accessory Adaptive Feedback Cancellation (AFC) The whistle (feedback) will be reduced by this function when you use the device * Wrist flexion and extension exerciser strengthens grip and forearm * Resistance can be varied from virtually zero up to 20 foot pounds * Designed to give you the comfort of an elastic support with the therapeutic properties of heat without the perspiration associated with neoprene * ProStyle retains heat to help keep muscle loose * Offers treatment for ACL LCL MCL PCL sprains * Recommened for swollen or tender knees resulting from: sprains strains sports injuries or post operative rehab * Offers treatment for Osgood Schlatter Disease as well as patellar instability * HCPC Code L1810