+ another for Tom Krein's beaded G-10...
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As an aside, even the slicker of the phenolics can be made grippier by roughing and raising the fibers on the spine ala Bob Dozier. Top pic below is Dozier's standard polished flats, roughened spine. Middle is from the best filet maker out there IME, Phil Wilson. Phil prefers linen, with a 600 grit sandpaper finish on all surfaces. Bottom is an Ingram of course,with his very attractive beaded finish. It's quite grippy, but I raised the fiber on the spine with a flapper wheel out of habit...

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Similar to add's bike tube, I use electrical shrink wrap on finer handles to protect and give purchase. Slip it on, hit it with the heat gun/hair dryer and it's there 'til you want it off, then you can't tell it was there once it's gone.

You can no more tell someone how to do something you've never done, than you can come back from somewhere you've never been...