Q. To prevent foot blisters: cover your feet liberally with antiperspirant. This works great. I think it stops the sweating and decreases friction.
A. Years ago, a double-blind study was conducted with cadets of the U.S. Military Academy serving as subjects. Some of the cadets used antiperspirant while others used placebo for three nights prior to a long hike. Only 21 percent of the antiperspirant group developed blisters, compared to 48 percent in the placebo group (Journal of the American Academy of Dermatology, August 1998).
Another reader agrees with you: “To avoid blisters, put antiperspirant on your feet. Wear double layer, wicking socks.”
