What is the Mc David Knee Pad? A single elasticated sleeve, featuring a padded insert designed to protect the knee joint from injury. When can I use it? Ideal for knee protection during sports, especially volleyball, basketball, handball, skateboarding & mixed martial arts (MMA). What size is it? If you are between sizes, please choose the larger size. Measure round the knee: Small 30-35cm (11¾"-13¾") Medium 35-38cm (13¾"-15") Large 38-43cm (15"-17") X-Large 43-50cm (17"-19¾") XX-Large 50-56cm (19¾"-22") Length: 28cm (11") How does it work? A Sorbothane viscoelastic insert in the Mc David Knee Pad protects the patella from impacts & scrapes, while the four-way stretch material offers compression & support to soft tissue. Nylon facing on the inner & outer surfaces increases protection & durability. Sold singly. Available in black.