I've dialed in my position and I'm now really comfortable, but one problem remains... although I feel I can sit on my saddle (Bontrager Hilo XXX) for days on end, I'm still slipping forward a bit in aero causing me biceps to get tired. I know some pro cycling teams have added some kind of grip tape to their saddles in years past (and I don't want to add the sandpaper Tony Martin used for obvious reasons!), is that commercially available? Any DIY ideas?

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin