1.   About six months ago, I also began wearing magnetic knee sleeves when I played tennis and sometimes for my daily three-mile walk.

2.   He said he was even going to switch from wearing a cumbersome knee sleeve with hinges to one without hinges.

3.   Instead, they fitted him with a knee sleeve.

4.   Magnetic knee sleeves like these are used to alleviate pain from ailments such as arthritis.