The shoes rely on N45 neodymium magnets, which are among the most powerful permanent magnets known. There are different levels of magnets, like N40, 42 and 45, and their strength level depends on their composition, which is primarily a mix of neodymium, iron and boron, said Patrick Jreijiri, a mechanical engineer and designer for the shoes.

There are around 12 to 13 magnets on one layer that repel a mirror image of 12 to 13 magnets on another layer in each shoe. The repellent force comes from the orientation of the magnets, which are arranged so that their north poles align with each other.

The magnets range from 2.5 to 5 centimetres (cm) in diameter. The 5cm magnets are strong enough to move 12 kilogrammes (kg) of material, and the 2.5cm magnets are capable of moving objects up to 24kg, Jreijiri said.

The magnets and resulting repulsion cover the entire area of the foot, so when a person is walking, they are pushing against the combined strength of the magnets, Jreijiri said.

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