T1, Over-head Hearband NRR dB: 26 Non-deforming comfort headband fits all head sizes. Ventilated inner headband and soft pads for maximum comfort. Quick-Click height adjustments. Dielectric design safe for electrical environments. Features patented Air Flow ControlTM technology for optimal attenuation across all frequencies. Snap-in ear cushion makes replacement quick and easy. Hygiene kits available.