I bought a set of kayak grips last year before kayak the 112 mile Schuylkill River Sojourn.  Not sure if I'd need them but had never kayaked that far.  It takes a little time to get them set in the right location but work great.  They are a gel neoprene material.  You guy can try them this coming weekend at Raystown.

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They're called Yakgrips.  You can order them online or at many kayak stores. $12...ish
If you Google Yakgrips and you can find them all over the place.

Here is the manufactures website. 
http://www.yakpads.com/