I found Superfeet to be a little too stiff. I started with Superfeet and switched over to Spenco Hiker somewhere around maybe Hot Springs. Spenco were a little less expensive too. I probably used 4-5 pairs of Spenco or Superfeet for my entire AT thru-hike, usually swapping out insoles when I swapped out shoes.
It would be important to know to take out the built-in insoles of a shoe or boot prior to inserting the Spenco or Superfeet insoles. There is not enough room for both the built-in insole that comes delivered with the shoe along with the Spenco or Superfeet insole.
Probably the most cause of pain (well, besides the rocks hitting the bottoms of your feet) was from eithe shoes that were too small (your foot expands greatly when carrying that backpack) or the rain causing the lining of the shoe to expand and cut into your wet feet. I was schooled by other thru-hikers prior to starting my AT thru-hike that I should buy shoes that were at least 1.5 sizes larger than my street shoe size in order to make room for my feet to expand while I hike.
Now, eight years later, I take a size 13 shoe in hiking shoe and a size 12 in street shoe. Before my AT thru-hike I wore a 10.56 size street shoe.
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