The band design allows earplugs to rest comfortably around the neck when not in use, benefiting workers that move to & from loud noise areas; With a noise reduction rating of 25dB, the soft pods provide a universal fit and effective sound-blocking. Reusable, lightweight and easy to use, made with a non-allergenic polymer material, these can be washed and reused dozens of times, helping to reduce wastage; The Hi-Vis green band offers a great balance of protection and comfort. With a lightweight and portable design that prevents the ear pods from touching dirty or contaminated surfaces, these are easy to use in environments with regular or intermittent noise hazards. Ideal for workers on construction work sites, airports, racetracks, factory and shop applications and wherever reusable ear protection is required, these are Independently tested and certified to NRR 27 (ANSI S3.19) and CSA Class AL. Compatible with Sellstrom's Replacement earplugs (S23431).