For footwear. Effectively eliminates unwanted odours. Neutralises foot sweat odour and guarantees to keep your shoes fresh and odour free. Easy to use. Contains no chemicals or artificial fragrances. Neutralises all odours in your shoes Easy to insert Keeps shoes smelling freshHow a Smellkiller worksOdour removal has never been this simple, stylish and environmentally friendly.The patented Smellkiller neutralises and prevents the production of the molecules that create bad smells. The best feature of Smellkiller is that in contrast to other products, it uses no chemicals or artificial fragrances. No dangerous substances are released into the environment. You can use the Smellkiller every day.Bad smells mostly consist of sulphur molecules. These are eliminated as soon as Smellkiller comes into contact with water and air.If you imagine a smell as a string of different sized particles that form an “odour chain”. If you break this “odour chain” and are just left with the individual particles, you break the pattern and the bad smell disappears. Because odours are organic substances, no hazardous waste is created when the odour chain is broken.Zielonka Smellkillers are made of high-grade German stainless steel.