I asked this same question last fall. A couple of replies pointed me to a Fiberbuilt mat. I got mine at http://www.rangemart.com/fiberbuilt.htm . I love it; you can really hit down on it without the pain.
It’s funny I got a Calloway catalog right before Christmas that had Phil Mickelson on the cover. Inside it showed him at the Callaway testing center. It looks like they use Fiberbuilt mats.
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