NL Times, October 14, 2016

"Ajax decided to replace the artificial turf on four training fields in training complex De Toekomst. These turfs contain the much discussed rubber granules. And the Amsterdam team decided to rather remove the turfs as a precaution after a number of scientists expressed concerns about possible health risks to players, AD reports."

Pittsburgh Steelers, August 18, 2016

Great 3 minute video showing the extraordinary grass turf at the Steelers' Heinz Field.

Baltimore Ravens, August 2, 2016

"The Ravens switched to a natural grass surface this offseason, and the players were impressed with the condition of the field."

The Baltimore Sun, May 11, 2016

"Every five years or so the Ravens replace the surface of their playing field, and for the first time since 2002, the team will dig its cleats into true grass at home."

Baltimore Ravens, December 4, 2015

"[The Ravens] found a different strain of grass, from a sod farm in North Carolina that are a mixture of Burmuda and some rye grass, that they believe will be more robust than what they previously used in the stadium. The Ravens also plan to use artificial light to keep grass growing where the field is shaded.

'There have been a lot of technological advances with the grass from what I’m told,' Harbaugh said. 'Our grounds people have done a great job of researching it, and they feel like they have the type of grass now that can thrive in there.' "

The New York Times, September 11, 2013

"Where once a dozen stadiums featured faux fields, this season there are only two."