Stanley Leightning L1 Slimline Low Profile Earmuff (RST-63006) Contemporary, slimline, low-profile design Super-soft ear cushion eliminates "squeezing" sensation on head Headband features telescopic adjustment for custom fit, steel wire construction to withstand demanding use and padded foam to minimize pressure on head Earcup features patented Air Flow Control technology to reduce sound across all frequencies without increasing earcup size or weight Noise Reduction Rating (NRR) 25