NFL makes knee and thigh pads mandatory for 2013-14 season

NFL Making Thigh And Knee Pads Mandatory In '13 - CBS Philadelphia

NFL training camp buzz: Steelers add QB Zach Mettenberger

Important NHL Rule Changes for 2013-14 Season That Flew Under the Radar, News, Scores, Highlights, Stats, and Rumors

The N.F.L.'s Incredible Shrinking Pads - The New York Times

NFL making thigh and knee pads mandatory in '13 – Macomb Daily

NFL says players must wear thigh, knee pads in 2013 - ESPN

Why Don't Nfl Players Wear Knee Pads? - Metro League

New NFL rules: Leg, thigh pads are mandatory to protect players

NFL, players adjusting to mandatory knee, thigh pad rule change – Baltimore Sun

League mandates use of knee and thigh pads, Sports