What is the Donjoy 4 Titude Knee Brace? Ideal for rehabilitation of all knee ligament & cartilage injuries for active, sedentary & adolescent patients. Also ideal for support when returning to skiing & sports. When can I use it? Short calf design gives boot clearance making it perfect for skiing Provides protection during rehabilitation following MCL, LCL, PCL or ACL injury or surgery Knee support during rehabilitation following surgery for a torn cartilage ACL, PCL & Combined Instability versions available (indicate version when ordering) One-year warranty on frame & hinge. What size is it? State left or right knee. Measure around the thigh, 15cm (6") above the kneecap. If you are between sizes, please choose the larger size. X-Small 33-39cm (13-15½") Small 39-47cm (15½-18½") Medium 47-53cm (18½-21") Large 53-60cm (21-23½") X-Large 60-67cm (23½-26½") XX-Large 67-75cm (26½-29½") XXX-Large 75-82.5cm (29½-32") How does it work? It has a short below knee section which means it fits comfortably above ski boots. The Donjoy 4 Titude Knee Brace features the Donjoy Four Points of Leverage® system which will make your knee joint feel stable by providing control over extension & flexion of the knee joint. With a low profile, lightweight design, this knee brace has mouldable cuffs for a custom fit & removable thermal-formed liners & strap pads for unbelievable comfort. Please Note if buying from abroad: These products are sent direct from the manufacturer & so lead times will be significantly longer than normal if you purchase this item from outside the UK