New York Giants wide receiver Odell Beckham Jr., stretches out with his cleats on during the team's NFL football training camp, Thursday, Aug. 6, 2015, in East Rutherford, N.J. (AP Photo/Julie Jacobson)

Detroit Lions cornerback Darius Slay's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Denver Broncos strong safety T.J. Ward (43) cleats worn to drills at the team's NFL football training camp Friday, Aug. 7, 2015, in Englewood, Colo. (AP Photo/David Zalubowski)

Denver Broncos defensive back Darian Stewart (26) cleats on way to drills at the team's NFL football training camp Friday, Aug. 7, 2015, in Englewood, Colo. (AP Photo/David Zalubowski)

Tennessee Titans wide receiver Hakeem Nicks gets set to run a drill during NFL football training camp Wednesday, Aug. 5, 2015, in Nashville, Tenn. (AP Photo/Mark Humphrey)

Denver Broncos cornerback Aqib Talib (21) wears cleats to drills at the team's NFL football training camp Friday, Aug. 7, 2015, in Englewood, Colo. (AP Photo/David Zalubowski)

Detroit Lions wide receiver Golden Tate's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

New York Giants wide receiver Odell Beckham Jr.'s cleats grip the turf (13) during the team's NFL football training camp, Thursday, Aug. 6, 2015, in East Rutherford, N.J. (AP Photo/Julie Jacobson)

Denver Broncos cornerback Aqib Talib (21) puts on cleats to take part in drills at the team's NFL football training camp Friday, Aug. 7, 2015, in Englewood, Colo. (AP Photo/David Zalubowski)

Detroit Lions tight end Eric Ebron's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Detroit Lions wide receiver Golden Tate's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Carolina Panthers' Cam Newton (1) stretches during the NFL football team's training camp in Spartanburg, S.C., Wednesday, Aug. 5, 2015. (AP Photo/Chuck Burton)

Detroit Lions linebacker Kyle Van Noy's cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Carolina Panthers' Kony Ealy walks down the field during the NFL football team's training camp in Spartanburg, S.C., Wednesday, Aug. 5, 2015. (AP Photo/Chuck Burton)

Detroit Lions wide receiver Calvin Johnson's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Detroit Lions running back Ameer Abdullah's Adidas cleats are shown during NFL football training camp in Allen Park, Mich., Thursday, Aug. 6, 2015. (AP Photo/Paul Sancya)

Jacksonville Jaguars strong safety Craig Loston is seen in multi colored cleats during practice at NFL football training camp, Wednesday, Aug. 5, 2015, in Jacksonville, Fla. (AP Photo/John Raoux)

New York Giants tight end Jerome Cunningham walks off the field wearing multi-colored cleats after the team's NFL football training camp, Thursday, Aug. 6, 2015, in East Rutherford, N.J. (AP Photo/Julie Jacobson)

One of Miami Dolphins wide receiver Jarvis Landry's cleats is shown at the teams NFL football training camp, Wednesday, Aug. 5, 2015 in Davie, Fla. (AP Photo/Wilfredo Lee)

Detroit Lions linebacker Josh Bynes Under Armour cleats are shown during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 4, 2015. (AP Photo/Paul Sancya)

Jacksonville Jaguars wide receiver Bryan Walters' cleats are seen during practice at NFL football training camp, Wednesday, Aug. 5, 2015, in Jacksonville, Fla. (AP Photo/John Raoux)

Arizona Cardinals' CPhillip Sims' cleats are shown during work outs during an NFL football training camp, Wednesday, Aug. 5, 2015, in Glendale, Ariz. (AP Photo/Matt York)

Jacksonville Jaguars running back T.J. Yeldon wearing gold cleats during practice at NFL football training camp, Wednesday, Aug. 5, 2015, in Jacksonville, Fla. (AP Photo/John Raoux)

Arizona Cardinals' Carson Palmer's cleats are shown during work outs during an NFL football training camp, Wednesday, Aug. 5, 2015, in Glendale, Ariz. (AP Photo/Matt York)

Detroit Lions defensive end Devin Taylor's Under Armour cleats are shown during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 4, 2015. (AP Photo/Paul Sancya)

Jacksonville Jaguars tight end Ben Koyack cleats are seen during practice at NFL football training camp, Wednesday, Aug. 5, 2015, in Jacksonville, Fla. (AP Photo/John Raoux)

Detroit Lions wide receiver Calvin Johnson's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 4, 2015. (AP Photo/Paul Sancya)

St. Louis Rams running back Tre Mason wears gold cleats during training camp at the NFL football team's practice facility Tuesday, Aug. 4, 2015, in St. Louis. (AP Photo/Jeff Roberson)

Detroit Lions tight end Eric Ebron's Nike cleats are shown during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 4, 2015. (AP Photo/Paul Sancya)

Tampa Bay Buccaneers outside linebacker Kwon Alexander's cleat during a Buccaneers NFL football training camp practice Tuesday, Aug. 4, 2015, in Tampa, Fla. (AP Photo/Chris O'Meara)

Miami Dolphins kicker Andrew Franks prepares to kick the ball at the teams NFL football training camp, Tuesday, Aug. 4, 2015 in Davie, Fla. (AP Photo/Wilfredo Lee)

Dallas Cowboys wide receiver Dez Bryant cleats during Dallas Cowboys' NFL training camp, Tuesday, Aug. 4, 2015, in Oxnard, Calif. (AP Photo/Gus Ruelas)

Tampa Bay Buccaneers outside linebacker Kwon Alexander's cleats during a Buccaneers NFL football training camp practice Tuesday, Aug. 4, 2015, in Tampa, Fla. (AP Photo/Chris O'Meara)

Tampa Bay Buccaneers defensive tackle Gerald McCoy's cleats during a Buccaneers NFL football training camp practice Tuesday, Aug. 4, 2015, in Tampa, Fla. (AP Photo/Chris O'Meara)

Detroit Lions safety Nate Ness's cleat is shown during NFL football training camp in Allen Park, Mich., Tuesday, Aug. 4, 2015. (AP Photo/Paul Sancya)

St. Louis Rams linebacker Daren Bates wears red cleats during training camp at the NFL football team's practice facility Tuesday, Aug. 4, 2015, in St. Louis. (AP Photo/Jeff Roberson)

New York Jets defensive back Darrelle Revis' cleats are shown as he takes part in drills during practice at NFL football training camp, Tuesday, Aug. 4, 2015, in Florham Park, N.J. (AP Photo/Frank Franklin II)

St. Louis Rams wide receiver Tavon Austin wears colorful cleats during training camp at the NFL football team's practice facility Tuesday, Aug. 4, 2015, in St. Louis. (AP Photo/Jeff Roberson)