In addition to the dimensions others posted, I'll add this information that Oxford emailed to me when I was trying to decide:
OF690Z- Heaterz Premium Adventure - Of the 3, this is slightly longer and like the Touring having a firmer and solid feel.
OF691Z- Heaterz Premium Touring-- Firm, stiff and solid.
OF692Z- Heaterz Premium Sports- Soft and squishy feel.
So, with the size of the Sports sounding just right, and wanting a little more squish, I ordered the Sports. But I procrastinated in installing them and ended up switching to a Concours to do more 2-up touring with my son. The Connie comes stock with heated grips, so I still have the Oxford Sports new-in-box. If anyone is interested, PM me.
2015 Concours 14 ABS, 2014 Versys 650 ABS, 2006 Vulcan 500 (sold)