There was a scare with TriAcetone-TriPeroxide in shoes a few years ago; I think this is why we are still taking off our shoes. Modern solutions make the safety

There was a scare with TriAcetone-TriPeroxide in shoes a few years ago; I think this is why we are still taking off our shoes. Modern solutions make the safety aspect quite simple, exhibiting stability until hypersonic shockwave conditions.