In reply to Nutty:
Right, the response I got is typically thorough, so many thanks to Glyn at Scarpa for sparing the time:
The new Instinct slipper is FJ lasted. FJ has actually got the same forefoot Width/Vol as VS/VSR (FV) but does have a narrower (more secure) heel cup, which makes sense on a slipper (only Heinz/Scarpa would design a separate slipper version of the main Instinct FV last...)
Why did the SR then feel narrower than original slipper if last shape in the forefoot the same? Probably more to do with the increased rubber overlay on the top of the SR vs the original instinct S. At least initially this would make the slipper feel narrower until bedded in.
How will the new slipper feel compared to the original Instinct S? Highly subjective depending on foot shape! However important to remember that its still the same vol/width as the original slipper. The rubber overlay on the top of the slipper will still inevitably have an effect. However the difference with the new slipper from the SR is the more sophisticated use of different rubbers across the top of the foot with different levels of elasticity.
For most I would say the new slipper should initially feel somewhere between the original slipper and the SR in forefoot width, although with a narrower heel of course. Its very much an Instinct shape at its heart and what you should definitely feel is more power/support than either of the two previous versions due to the more comprehensive tensioning system.
And if you feel all of this slipper evolution still isn’t as good as your original Instinct S then you should get Scarpa to refurb your original slippers so they can live
Their best life again…and again…