Funny Question about Caligae

[Gaius Julius Caesar]

Caligae are pretty adjustable, and if you get them adjusted to your foot, they are very comfortable. I think if you were in very sandy terrain, the sand might be a problem, rubbing the foot between the leather and skin, but that would be true for just about any kind of shoe, including modern military boots.
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I think the gaps in the caligae actually allowed sand to fall out, potentially minimizing that problem, but I could be wrong. certainly gets rid og stones anyway 8)