Are there any Mag boots, either as equipment or armor mod?

I think the description of the spacesuit and the EVA powersuit (Suns of Fortune) mention them, but not in a mechanical sense.

My EOTE character had our outlaw tech build him a pair. We decided they would add a boost die to athletics or coordination checks when on metal surfaces.

EDIT: I should've made clear they add a boost to PERTINENT athletics or coordination checks. It has to make sense they'd be able to help in order for them to give a boost die.

At any time? I would figure they'd just remove an environmental disadvantage for zero g... How would they be useful in normal gravity?

Climbing, not falling off the top of a moving speeder or grav train, that sort of thing.

Oh ok that makes sense