Think about this. Semi-weighted. That's right. The shop that I used to work at does conformables in a semi-weighted position. How does this work you ask?
Conformables use the vaccum bags to take a mold of the foot. Most shops do this as a weighted system with the person standing on them. The philosophy against this is as was stated above. If the person tends to pronate or supanate, then standing on the bags doesn't prevent the feet from doing this to a certain extent. So you end up with footbeds that don't keep your feet in the neutral position.
Is Superfeet an unweighted system because you sit with your feet hanging? No. The technician building the footbeds lifts the foot into the desired neutral position. So it is actually the same as putting weight on that foot, but without the rolling of the ankle.
Anyhow, about a semi-weighted system. This shop has the person sitting with their feet resting on the vaccum bags. The foot is pressed down onto the bags to make a nice deep mold (weighted?). Then the foot is massaged into a neutral position and the form taken of the feet. This eliminates the problem of the feet collapsing while standing on the bags and does not rely on the tech to hold your feet in the exact position (a la superfeet) while the mold is taken. This is a technique taught by MasterFit University. A clinic put on by some of the best bootfitters around. They should have a website up soon at www.bootfitter.com
I don't think it is up yet, but it should help to answer a lot of the questions that seem to be floating around out there about boot fitting and custom footbeds.
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