Proprioceptive stimulation is provided by a silicone patellar insert and an elastic compressive knit of approximately 24 mmHg. Flexible lateral reinforcements increase support and there is a lateral silicone anti-slip system for better hold. There is a choice of open or closed patella. Silicone Patellar Insert Flexible Lateral Reinforcements Lateral Silicone Anti-slip System Size Guide Size 1: 31-33 cm Knee circumference Size 2: 34-36 cm Knee circumference Size 3: 37-39 cm Knee circumference Size 4: 40-42 cm Knee circumference Size 5: 43-45 cm Knee circumference Size 6: 46-48 cm Knee circumference