Petroleum Jelly: I know of a Leukemia Society Team in Training coach who recommends slathering your feet thickly with petroleum jelly for long-distance walks and marathons. This is an inexpensive, readily available option -- Vaseline is the name brand. At most marathons they have it available at the rest stops so you can reapply it.
AD Ointment: Thicker than petroleum jelly, yet still available wherever baby diapers are sold, this can also do the job. Again, more is probably better.
BodyGlide, Sports Slick, Hydropel: These products can be found at running stores and go on like a stick of deodorant, or come in a handy tube. In my experience, they work well on the feet for distances of 10 miles or less, but above that have failed. It would be a good idea to re-apply them during the walk. But keep these around to use to prevent chafing of other body parts.
Teflon: Some socks are incorporating Teflon to prevent friction.
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