Black soundproof earmuffs with adjustable headband. [ProCase] Soundproof earmuffs for adults, noise-canceling, with adjustable headband, ear covers, hearing protection headphones, noise reduction rate: NRR 28dB - [Color] Black 【Comfortable Fit】 The headband is made of plastic and flexible material, so there is not much pressure when wearing it, and the ear cups have soft cushions for an excellent fit to the ears. 【Certified Certification】 The earmuffs, consisting of a solid DBS shell and soundproof foam, are certified with a noise reduction of NRR 26dB in the ANSI S3.19 (USA) test stand, and can significantly block noise. 【Free Size】 The elastic soft padded headband fits all head sizes, and the 360-degree rotating ear cups with foam can be adjusted to fit children's to adults' heads. 【Foldable】 Can be folded when not in use for easy storage, lightweight and convenient to carry. 【Applicable Places】 Suitable for sports, factories, photography, construction sites, airports, carpenters, research, study, and sleeping. Used only once or twice in class. No pets, no smokers. Immediate purchase OK, same-day shipping.