Due to the nature of the product, all sales are final and cannot be returned or exchanged. Silx makes no warrantees that our masks will prevent any infections or transmissions of diseases of any kind or viruses. Otherwise, practising proper social distancing and personal hygiene should be maintained. Our face masks are non-medical grade and shouldn't be worn on children under the age of two. Face mask coverings should not be worn by those who suffer from respiratory problems or have difficulty breathing.