PRODUCT DESCRIPTION 4 ways weaving for better comfort Retains body heat to warm the joint APPLICATION Mild sprain Mild pain Arthritis Warmth Weakness SIZE: Measure circumference just above ankle bone. Small 8 – 8¾ (inch) 20.3 – 22.2 (cm) Medium 8½ – 9¼ (inch) 21.6 – 23.5 (cm) Large 9 – 9¾ (inch) 22.9 – 24.8 (cm) X-Large 9½ -10¼ (inch) 24.1 – 26.0 (cm)