Simple, lightweight, durable, adjustable
Headband rotates - can be worn over-the-head, behind-the-head, or under-the-chin
NRR 25dB behind-the-head*
Non-conductive, 100% dielectric plastic

* Note that the NRR may overestimate the hearing protection provided during typical use.
3M recommends reducing the advertised NRR by 50% for estimating the actual amount of noise reduction provided.