X-large * Fits Knee Circum. 15.5  - 16.25  (measurement Taken Just Under The Knee Cap While Knee Is Slightly Bent)  * Thermal Support For Prevention  Treatment & Rehabilitation Of The Knee * Provides Protection And Support Against General Wear And Tear Including Sprains  Strains And Twisted Knees * Anatomically Shaped In 3 Pieces For More Comfort And A Better Fit * Thermoskin Increases Elasticity Of Muscles  Tendons And Ligaments To Reduce The Risk Of Injury When Under Stress And Strain * Clinically Proven To Increase Surface Skin And Subcutaneous Temperature Between 2-3 Degrees F  The Optimal Level To Make Tendons And Muscles More Pliable And Elastic To Provide Optimal Muscle Function