Three different and exchangeable sets of filters to set optimal protection at different levels Very soft and comfortable material. Due to the body heat the plugs adapt to the shape of the auditory duct. Very small and hard to see when being worn Now available in elegant black edition Reusable, as built in durable material Black color is less likely to get dirty Open system - not completely shut off sounds and avoid feeling of isolation Comes with carrying case with filter compartment to keep your earplugs protected and clean Including cleaning spray A good quality and easy to use cord is added to the product to hang the plugs around your neck. Free spare earplug including in every pack