Stanley Leightning L2F Premium Folding Earmuff (RST-63007) Convenient, folding feature collapses earmuff for easy storage; slim, low-profile earcups wont interfere with your work Super-soft ear cushion eliminates "squeezing" sensation on head; snap-in feature allows for quick and easy cushion replacement 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) 27