Yeah Isospeed Control is definitely softer. It doesn't have a core like RIP Control.
I'm actually testing out an even softer ribbon construction multi than these, the cross from the Intellitour hybrid which shares the construction of Isospeed Control/Professional and is made by Isospeed for Head, however it is softer, on paper at least (RSI data).
Of course my test won't be for the Rev Pro Tour... which is a shame.
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