Precurved Anatomical Design with Dual Flexible Side Stabilizers. Tapers with Comfortable and consistent compression. Integrated Flexible Side Stabilizer Stays. Precurved Anatomical Design. -Padded Patella Buttress helps protect and stabilize knee cap. Four-Way Stretch Lycra Mesh at back of knee. Premium Stitching Assembly, Patella Support finishing and Lycra Binding for log lasting comfort. Convenient Finger Tabs offer easy grip pull when fitting. N-Tex Airflow Vented Neoprene. -Measure knee circumference 2" = 5cm below center of kneecap (patella), Size Medium Knee Inches 113–14, Knee CM 33–35.6