Premier Equine magnetic boots - sizing?

[NativePonyLover]

I'm looking at getting a pair of fetlock magnetic boots for my boy, but they only come in one size.

He's an approximately 14hh native pony and takes a pony/cob in boots normally, so I'm worried they might be a bit on the large size.

Does anyone know how the sizing comes up?

Thanks

 

[Bede]

I ordered some PE magnetic hoof boots, and they were tiny. Sorry, that may have no bearing on fetlock boots