Proximity Prevention is a gear perk that stops you setting off enemy proximity mines. It lets you walk through mined approaches to outposts and checkpoints without picking a path around every mine.
Enemy proximity mines ignore you when you step near them. You can move through a minefield on foot without stopping to spot or shoot each one.
Wear the Tactical Boots or Techmaster Boots in the feet slot. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Useful on infiltration builds that come in on foot. If you mostly drive or fly in, another feet perk will do more for you.