Radians Lowset 21 Earmuff has foam filled, cushion padding on earcups along with evenly spread tension in the headband which allows for comfortable wear while wearing protective safety glasses.Comfortable & lightweight hearing protection.Low profile design.Compact folding feature allows for easy storage and keeps particles out of the earcups.Adjustable headband with side wire guides allows for optimum fit.Padded moisture-wicking headband moves moisture away while providing cool comfort.NRR 21 dBCSA Z94.2 Class B