The 3M 1427 features three headband positions for versatility. Adjustable head strap secures the earmuff when the headband is worn under-the-chin or behind-the-head. Soft, foam-filled cushions fit comfortably yet securely over the ear. Lightweight design includes a padded headband for comfort. Tested to ANSI S3.19-1974. NRR 27 dB when worn over and behind the head and 26 dB when worn under the chin.**The NRR may overestimate the protection provided during typical use. 3M recommends reducing the NRR by 50% for estimating the amount of noise reduction provided.
