True Jr. earmuffs NRR 21 rating True smaller-frame padded headband Full-size earcups for full protection T-10 True Jr. safety glasses Impact-resistant polycarbonate lenses Wraparound lens design Soft nosepiece Comfortable temples True smaller-frame design Black synthetic frame Partially mirrored lenses ANSI Z-87+ certified Polycarbonate safety glasses protect your eyes from impact, but the glasses deteriorate due to scratches, light, etc., and should be replaced after 2 years.