Radians Def-Guard(TM) 23 Earmuff has adjustable headband slides to fit all sizes. Can be worn with earplugs for maximum hearing protection. FEATURES Soft, foam filled, padded earcups fit securely and comfortably over the ear. Lightweight, durable construction. Dielectric design. Adjustable headband. Wear over earplugs for additional protection. NRR 23 dB Mfg: Radians