Classic small earplugs have a slightly smaller diameter than regular size Classic earplugs to fit comfortably in smaller ear canals. Slow recovery, low pressure foam conforms to the unique shape of each ear for enhanced comfort and wearability. Moisture-resistant—helps maintain a consistent expansion time, even in humid situations. Flame resistant—important for potential arc flash situations and for storage considerations. CSA Class AL. Not too soft—stiff enough when compressed to make fitting easier yet soft enough to be comfortable in the ear for extended wear. Reusable Pillow Pack helps keep earplugs clean when they are not being worn.