CAS311-6001 / 311-6001 EARPLUG EAR CLASSIC SOFT W/ CORD Classic Soft™ Earplugs Classic Soft™ Earplugs feature the tested and proven cylindrical shape, but thats all that's classic about them. Made of a patented new foam, these plugs have a smaller cell structure and feel smoother to the touch than other earplugs. In addition, the thermal-reactive foam softens and shapes to the ear canal as it warms to body temperature. Classic Soft' Earplugs start out firm enough to make roll-down and insertion easy. Their softening and shaping forms an excellent seal against noise, and it makes extended wear very comfortable. NRR 31. Sold per box.