XD does not stand for extra distance. Rather, the XD is another great disc in the Innova series of putters. While it is not made for distance, it is your go-to putter on a long approach and long putts. Some actually use the putter as their distance disc when nothing else is available. The XD is only available in DX plastic. For those who are dyslexic, this can be very confusing (or very straightforward).