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 dB CSA Z94.2 Class B