The new Cliff Keen Signature 4-strap FOAM headgear is based on the revolutionary design of the original foam E41 that Cliff Keen patented nearly 50 years ago. The Signature's VNF foam boasts these same qualities that made it the best-selling ear...

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The "Cliff Keen Signature" 4-strap FOAM headgear is based on the revolutionary design of the original foam E41 that Cliff Keen patented over 50 years ago. The "Signature's" VNF foam boasts these same qualities that make it the best-selling ear...