Direct Sound Headphones EX-25 Extreme Isolation Stereo HeadphonesThe EX 25 Extreme Isolation Headphones from Direct Sound provide great sound quality in a comfortable design that blocks out a large amount of external noise. Designed in a similar fashion to noise isolating earmuffs, these heavy duty headphones use custom speaker assemblies designed to protect your eardrums. The speakers reside inside closed back earcups with thick padding that effectively reduce external noise by up to 25dB.