<P> In February 2010, the surface was pulled and upgraded to FieldTurf "Duraspine Pro", which was expected to meet FIFA standards that the previous turf did not, preventing the team from having to place sod on top of their turf to host international soccer matches . </P> <P> The surface was upgraded again in April 2014 to FieldTurf "Revolution" with "VersaTile" drainage system . The FieldTurf Revolution product is currently used at many venues across North America, including CenturyLink Field (home to the NFL's Seattle Seahawks and MLS's Seattle Sounders) and Providence Park, home of the MLS's Portland Timbers, where its installation was recently completed . </P> <P> When the field is configured for American football, the Patriots have their "Flying Elvis" logo painted on the field at dead center of the 50 - yard line . Off to both sides along the 50 - yard line, the Gillette Stadium logo is also painted on the field . This is a gray - and - yellow stylized representation of the bridge and tower at the north entrance of the stadium . </P> <P> In 2006, the Patriots and Kraft announced plans to build a "super regional lifestyle and entertainment center" in the area around Gillette Stadium named Patriot Place . The cost of the project was $350 million, more than the cost to build Gillette Stadium itself; Kraft had purchased much of the surrounding land, about 700 acres (280 ha), when he bought Foxboro Stadium in the late 1980s . </P>

What are the yellow markings on the patriots field
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