Nadal on his knees? What's in them?

Whenever I see Nadal takes the tape thingy (lol sorry) around their knees and want to know what is what concerns them? Is it just because they sell these belts tenniswarehouse.com tape. What to do? Does the person who leads to greater support for the knees? Links http://www.tennis-warehouse.com/Pro-Tec_Knee_Patellar_Tendon_Strap_Small/descpagePROTEC-PATSTRAPS.html Nadal-http: / / ontennis.com/files/images/rafael-nadal-wimbledon08-5_0.jpg

the two responses above me, was a bad bit! point belts is not relive the pain, but the main feature of them is somehow deteriration knees slow down eventually. They relive the pain of it!

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