Sounds like this shell test only pertains to the length of the boot. That is the easiest part to get right and if that was all that matters ordering boot online would be nearly worry free. But you also have toe width, heel width, ankle size, calf size, foot height, and overall foot volume.
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2011 Smokin Buck Ferton 155
2013 Flow NX2-SE
2013 Flow Hylite boa
Burton Stagger pants/jacket