The Closed Patella Knee Sleeve alleviates pain associated with, arthritis, patello-femoral pain, and general knee pain. It provides therapeutic warmth, compression and support to the knee joint area and has an open patella design. It fits comfortably and is highly durable. Features: - Alleviates common knee pains - Provides therapeutic warmth, compression and support - Closed patella design Sizing (Measure circumference just above patella): - Small: 13"-14" - Medium: 14"-16" - Large: 16"-18" - X-Large: 18"-20" - XX-Large: 20"-22"