Honeywell SmartFit Corded Reusable Earplugs are made from a patented Conforming Material Technology that uses body heat to custom-match the contour of the wearer's ear canal. The use of this technology allows for the maximum in comfort while securing comprehensive hearing protection. Designed to fit most ear canal sizes, these reusable earplugs come with a detachable cord and a storage case. Honeywell SmartFit Corded Reusable Earplugs feature a Noise Reduction Rating of 25.