Try using an arched shape maybe like a church window or door. Boolean it to your ground or terrain/snow. The arch would be a negative and would not appear in the ground leaving only its shape...aka footprint.....I'm thinking you'd need 2..one for the heel and a longer, more pointed one for the sole......

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...