Thanks for the contest. That's what I found.
1. Copper's antimicrobial properties have been known for more than five millennia.
2. Diabetes can cause a variety of problems with the feet. Friction, pressure from sock seams can potentially be a source of irritation for diabetic or sensitive feet. Bacteria can cause skin diseases.
The copper ions create a natural zone of protection for the wearer that safely and naturally eliminates 99.9% of the growth of foot odour causing bacteria.
3. The study showed that copper on surfaces such as taps, toilet seats and door handles could reduce contamination by 90-100pc.
Laboratory research has shown that microbes die much more quickly on contact with copper-based surfaces compared with materials like stainless steel which are usually found in hospitals.