Graphene

Graphene has unique “heating” properties.

An excerpt from the article 19 facts about graphene

This property is used in an innovative method of pain treatment (local heating of tissues to a temperature of about 80 degrees Celsius destroys nerves responsible for pain in the human body).

Pain-relieving graphene heating pads, heated graphene clothing, and other graphene thermal devices are already being produced. Their use helps, among others: patients suffering from back or knee pain.